gecko-dev/dom/ipc/TabParent.cpp

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "base/basictypes.h"

#include "TabParent.h"

#ifdef ACCESSIBILITY
#  include "mozilla/a11y/DocAccessibleParent.h"
#  include "nsAccessibilityService.h"
#endif
#include "mozilla/BrowserElementParent.h"
#include "mozilla/dom/ChromeMessageSender.h"
#include "mozilla/dom/ContentBridgeParent.h"
#include "mozilla/dom/ContentParent.h"
#include "mozilla/dom/DataTransfer.h"
#include "mozilla/dom/DataTransferItemList.h"
#include "mozilla/dom/Event.h"
#include "mozilla/dom/indexedDB/ActorsParent.h"
#include "mozilla/dom/IPCBlobUtils.h"
#include "mozilla/dom/PaymentRequestParent.h"
#include "mozilla/dom/RemoteFrameParent.h"
#include "mozilla/EventStateManager.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/gfx/DataSurfaceHelpers.h"
#include "mozilla/gfx/GPUProcessManager.h"
#include "mozilla/Hal.h"
#include "mozilla/IMEStateManager.h"
#include "mozilla/jsipc/CrossProcessObjectWrappers.h"
#include "mozilla/layers/AsyncDragMetrics.h"
#include "mozilla/layers/InputAPZContext.h"
#include "mozilla/layout/RenderFrame.h"
#include "mozilla/plugins/PPluginWidgetParent.h"
#include "mozilla/LookAndFeel.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/net/NeckoChild.h"
#include "mozilla/Preferences.h"
#include "mozilla/PresShell.h"
#include "mozilla/TextEvents.h"
#include "mozilla/TouchEvents.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/Unused.h"
#include "nsCOMPtr.h"
#include "nsContentAreaDragDrop.h"
#include "nsContentUtils.h"
#include "nsDebug.h"
#include "nsFocusManager.h"
#include "nsFrameLoader.h"
#include "nsFrameManager.h"
#include "nsIBaseWindow.h"
#include "nsIBrowser.h"
#include "nsIContent.h"
#include "nsIDocShell.h"
#include "nsIDocShellTreeOwner.h"
#include "nsIDOMWindow.h"
#include "nsIDOMWindowUtils.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsILoadInfo.h"
#include "nsIPromptFactory.h"
#include "nsITransportSecurityInfo.h"
#include "nsIURI.h"
#include "nsIWindowWatcher.h"
#include "nsIWebBrowserChrome.h"
#include "nsIWebProtocolHandlerRegistrar.h"
#include "nsIXULBrowserWindow.h"
#include "nsIXULWindow.h"
#include "nsViewManager.h"
#include "nsVariant.h"
#include "nsIWidget.h"
#include "nsNetUtil.h"
#ifndef XP_WIN
#  include "nsJARProtocolHandler.h"
#endif
#include "nsPIDOMWindow.h"
#include "nsPrintfCString.h"
#include "nsServiceManagerUtils.h"
#include "nsThreadUtils.h"
#include "PermissionMessageUtils.h"
#include "StructuredCloneData.h"
#include "ColorPickerParent.h"
#include "FilePickerParent.h"
#include "TabChild.h"
#include "LoadContext.h"
#include "nsNetCID.h"
#include "nsIAuthInformation.h"
#include "nsIAuthPromptCallback.h"
#include "nsAuthInformationHolder.h"
#include "nsICancelable.h"
#include "gfxPrefs.h"
#include "nsILoginManagerPrompter.h"
#include "nsPIWindowRoot.h"
#include "nsIAuthPrompt2.h"
#include "gfxDrawable.h"
#include "ImageOps.h"
#include "UnitTransforms.h"
#include <algorithm>
#include "mozilla/NullPrincipal.h"
#include "mozilla/WebBrowserPersistDocumentParent.h"
#include "ProcessPriorityManager.h"
#include "nsString.h"
#include "IHistory.h"
#include "mozilla/dom/WindowGlobalParent.h"
#include "mozilla/dom/CanonicalBrowsingContext.h"

#ifdef XP_WIN
#  include "mozilla/plugins/PluginWidgetParent.h"
#endif

#if defined(XP_WIN) && defined(ACCESSIBILITY)
#  include "mozilla/a11y/AccessibleWrap.h"
#  include "mozilla/a11y/Compatibility.h"
#  include "mozilla/a11y/nsWinUtils.h"
#endif

#ifdef MOZ_ANDROID_HISTORY
#  include "GeckoViewHistory.h"
#endif

using namespace mozilla::dom;
using namespace mozilla::ipc;
using namespace mozilla::layers;
using namespace mozilla::layout;
using namespace mozilla::services;
using namespace mozilla::widget;
using namespace mozilla::jsipc;
using namespace mozilla::gfx;

using mozilla::Unused;

// The flags passed by the webProgress notifications are 16 bits shifted
// from the ones registered by webProgressListeners.
#define NOTIFY_FLAG_SHIFT 16

namespace mozilla {
namespace dom {

TabParent::LayerToTabParentTable* TabParent::sLayerToTabParentTable = nullptr;

NS_IMPL_ISUPPORTS(TabParent, nsITabParent, nsIAuthPromptProvider,
                  nsISupportsWeakReference)

TabParent::TabParent(nsIContentParent* aManager, const TabId& aTabId,
                     const TabContext& aContext, uint32_t aChromeFlags)
    : TabContext(aContext),
      mFrameElement(nullptr),
      mContentCache(*this),
      mRect(0, 0, 0, 0),
      mDimensions(0, 0),
      mOrientation(0),
      mDPI(0),
      mRounding(0),
      mDefaultScale(0),
      mUpdatedDimensions(false),
      mSizeMode(nsSizeMode_Normal),
      mManager(aManager),
      mDocShellIsActive(false),
      mMarkedDestroying(false),
      mIsDestroyed(false),
      mChromeFlags(aChromeFlags),
      mDragValid(false),
      mTabId(aTabId),
      mCreatingWindow(false),
      mCursor(eCursorInvalid),
      mCustomCursorHotspotX(0),
      mCustomCursorHotspotY(0),
      mTabSetsCursor(false),
      mHasContentOpener(false)
#ifdef DEBUG
      ,
      mActiveSupressDisplayportCount(0)
#endif
      ,
      mLayerTreeEpoch{1},
      mPreserveLayers(false),
      mRenderLayers(true),
      mActiveInPriorityManager(false),
      mHasLayers(false),
      mHasPresented(false),
      mHasBeforeUnload(false),
      mIsMouseEnterIntoWidgetEventSuppressed(false),
      mIsActiveRecordReplayTab(false) {
  MOZ_ASSERT(aManager);
  // When the input event queue is disabled, we don't need to handle the case
  // that some input events are dispatched before PBrowserConstructor.
  mIsReadyToHandleInputEvents = !ContentParent::IsInputEventQueueSupported();
}

TabParent::~TabParent() {}

TabParent* TabParent::GetTabParentFromLayersId(layers::LayersId aLayersId) {
  if (!sLayerToTabParentTable) {
    return nullptr;
  }
  return sLayerToTabParentTable->Get(uint64_t(aLayersId));
}

void TabParent::AddTabParentToTable(layers::LayersId aLayersId,
                                    TabParent* aTabParent) {
  if (!sLayerToTabParentTable) {
    sLayerToTabParentTable = new LayerToTabParentTable();
  }
  sLayerToTabParentTable->Put(uint64_t(aLayersId), aTabParent);
}

void TabParent::RemoveTabParentFromTable(layers::LayersId aLayersId) {
  if (!sLayerToTabParentTable) {
    return;
  }
  sLayerToTabParentTable->Remove(uint64_t(aLayersId));
  if (sLayerToTabParentTable->Count() == 0) {
    delete sLayerToTabParentTable;
    sLayerToTabParentTable = nullptr;
  }
}

void TabParent::CacheFrameLoader(nsFrameLoader* aFrameLoader) {
  mFrameLoader = aFrameLoader;
}

/**
 * Will return nullptr if there is no outer window available for the
 * document hosting the owner element of this TabParent. Also will return
 * nullptr if that outer window is in the process of closing.
 */
already_AddRefed<nsPIDOMWindowOuter> TabParent::GetParentWindowOuter() {
  nsCOMPtr<nsIContent> frame = GetOwnerElement();
  if (!frame) {
    return nullptr;
  }

  nsCOMPtr<nsPIDOMWindowOuter> parent = frame->OwnerDoc()->GetWindow();
  if (!parent || parent->Closed()) {
    return nullptr;
  }

  return parent.forget();
}

void TabParent::SetOwnerElement(Element* aElement) {
  // If we held previous content then unregister for its events.
  RemoveWindowListeners();

  // If we change top-level documents then we need to change our
  // registration with them.
  RefPtr<nsPIWindowRoot> curTopLevelWin, newTopLevelWin;
  if (mFrameElement) {
    curTopLevelWin = nsContentUtils::GetWindowRoot(mFrameElement->OwnerDoc());
  }
  if (aElement) {
    newTopLevelWin = nsContentUtils::GetWindowRoot(aElement->OwnerDoc());
  }
  bool isSameTopLevelWin = curTopLevelWin == newTopLevelWin;
  if (curTopLevelWin && !isSameTopLevelWin) {
    curTopLevelWin->RemoveBrowser(this);
  }

  // Update to the new content, and register to listen for events from it.
  mFrameElement = aElement;

  if (newTopLevelWin && !isSameTopLevelWin) {
    newTopLevelWin->AddBrowser(this);
  }

  if (mFrameElement) {
    bool useGlobalHistory = !mFrameElement->HasAttr(
        kNameSpaceID_None, nsGkAtoms::disableglobalhistory);
    Unused << SendSetUseGlobalHistory(useGlobalHistory);
  }

#if defined(XP_WIN) && defined(ACCESSIBILITY)
  if (!mIsDestroyed) {
    uintptr_t newWindowHandle = 0;
    if (nsCOMPtr<nsIWidget> widget = GetWidget()) {
      newWindowHandle =
          reinterpret_cast<uintptr_t>(widget->GetNativeData(NS_NATIVE_WINDOW));
    }
    Unused << SendUpdateNativeWindowHandle(newWindowHandle);
    a11y::DocAccessibleParent* doc = GetTopLevelDocAccessible();
    if (doc) {
      HWND hWnd = reinterpret_cast<HWND>(doc->GetEmulatedWindowHandle());
      if (hWnd) {
        HWND parentHwnd = reinterpret_cast<HWND>(newWindowHandle);
        if (parentHwnd != ::GetParent(hWnd)) {
          ::SetParent(hWnd, parentHwnd);
        }
      }
    }
  }
#endif

  AddWindowListeners();
  TryCacheDPIAndScale();

  // Try to send down WidgetNativeData, now that this TabParent is associated
  // with a widget.
  nsCOMPtr<nsIWidget> widget = GetTopLevelWidget();
  if (widget) {
    WindowsHandle widgetNativeData = reinterpret_cast<WindowsHandle>(
        widget->GetNativeData(NS_NATIVE_SHAREABLE_WINDOW));
    if (widgetNativeData) {
      Unused << SendSetWidgetNativeData(widgetNativeData);
    }
  }

  if (mRenderFrame.IsInitialized()) {
    mRenderFrame.OwnerContentChanged();
  }
}

NS_IMETHODIMP TabParent::GetOwnerElement(Element** aElement) {
  *aElement = do_AddRef(GetOwnerElement()).take();
  return NS_OK;
}

void TabParent::AddWindowListeners() {
  if (mFrameElement) {
    if (nsCOMPtr<nsPIDOMWindowOuter> window =
            mFrameElement->OwnerDoc()->GetWindow()) {
      nsCOMPtr<EventTarget> eventTarget = window->GetTopWindowRoot();
      if (eventTarget) {
        eventTarget->AddEventListener(NS_LITERAL_STRING("MozUpdateWindowPos"),
                                      this, false, false);
      }
    }
  }
}

void TabParent::RemoveWindowListeners() {
  if (mFrameElement && mFrameElement->OwnerDoc()->GetWindow()) {
    nsCOMPtr<nsPIDOMWindowOuter> window =
        mFrameElement->OwnerDoc()->GetWindow();
    nsCOMPtr<EventTarget> eventTarget = window->GetTopWindowRoot();
    if (eventTarget) {
      eventTarget->RemoveEventListener(NS_LITERAL_STRING("MozUpdateWindowPos"),
                                       this, false);
    }
  }
}

void TabParent::DestroyInternal() {
  IMEStateManager::OnTabParentDestroying(this);

  RemoveWindowListeners();

#ifdef ACCESSIBILITY
  if (a11y::DocAccessibleParent* tabDoc = GetTopLevelDocAccessible()) {
    tabDoc->Destroy();
  }
#endif

  // If this fails, it's most likely due to a content-process crash,
  // and auto-cleanup will kick in.  Otherwise, the child side will
  // destroy itself and send back __delete__().
  Unused << SendDestroy();

#ifdef XP_WIN
  // Let all PluginWidgets know we are tearing down. Prevents
  // these objects from sending async events after the child side
  // is shut down.
  const ManagedContainer<PPluginWidgetParent>& kids =
      ManagedPPluginWidgetParent();
  for (auto iter = kids.ConstIter(); !iter.Done(); iter.Next()) {
    static_cast<mozilla::plugins::PluginWidgetParent*>(iter.Get()->GetKey())
        ->ParentDestroy();
  }
#endif

  SetIsActiveRecordReplayTab(false);
}

void TabParent::Destroy() {
  // Aggressively release the window to avoid leaking the world in shutdown
  // corner cases.
  mBrowserDOMWindow = nullptr;

  if (mIsDestroyed) {
    return;
  }

  DestroyInternal();

  mIsDestroyed = true;

  if (XRE_IsParentProcess()) {
    ContentParent::NotifyTabDestroying(this->GetTabId(),
                                       Manager()->AsContentParent()->ChildID());
  } else {
    ContentParent::NotifyTabDestroying(this->GetTabId(), Manager()->ChildID());
  }

  mMarkedDestroying = true;
}

mozilla::ipc::IPCResult TabParent::RecvEnsureLayersConnected(
    CompositorOptions* aCompositorOptions) {
  if (mRenderFrame.IsInitialized()) {
    mRenderFrame.EnsureLayersConnected(aCompositorOptions);
  }
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::Recv__delete__() {
  if (XRE_IsParentProcess()) {
    ContentParent::UnregisterRemoteFrame(
        mTabId, Manager()->AsContentParent()->ChildID(), mMarkedDestroying);
  } else {
    Manager()->AsContentBridgeParent()->NotifyTabDestroyed();
    ContentParent::UnregisterRemoteFrame(mTabId, Manager()->ChildID(),
                                         mMarkedDestroying);
  }

  return IPC_OK();
}

void TabParent::ActorDestroy(ActorDestroyReason why) {
  if (mRenderFrame.IsInitialized()) {
    // It's important to unmap layers after the remote browser has been
    // destroyed, otherwise it may still send messages to the compositor which
    // will reject them, causing assertions.
    RemoveTabParentFromTable(mRenderFrame.GetLayersId());
    mRenderFrame.Destroy();
  }

  // Even though TabParent::Destroy calls this, we need to do it here too in
  // case of a crash.
  IMEStateManager::OnTabParentDestroying(this);

  // Prevent executing ContentParent::NotifyTabDestroying in
  // TabParent::Destroy() called by frameLoader->DestroyComplete() below
  // when tab crashes in contentprocess because ContentParent::ActorDestroy()
  // in main process will be triggered before this function
  // and remove the process information that
  // ContentParent::NotifyTabDestroying need from mContentParentMap.

  // When tab crashes in content process,
  // there is no need to call ContentParent::NotifyTabDestroying
  // because the jobs in ContentParent::NotifyTabDestroying
  // will be done by ContentParent::ActorDestroy.
  if (XRE_IsContentProcess() && why == AbnormalShutdown && !mIsDestroyed) {
    DestroyInternal();
    mIsDestroyed = true;
  }

  RefPtr<nsFrameLoader> frameLoader = GetFrameLoader(true);
  nsCOMPtr<nsIObserverService> os = services::GetObserverService();
  if (frameLoader) {
    nsCOMPtr<Element> frameElement(mFrameElement);
    ReceiveMessage(CHILD_PROCESS_SHUTDOWN_MESSAGE, false, nullptr, nullptr,
                   nullptr);
    frameLoader->DestroyComplete();

    if (why == AbnormalShutdown && os) {
      os->NotifyObservers(ToSupports(frameLoader), "oop-frameloader-crashed",
                          nullptr);
      nsCOMPtr<nsIFrameLoaderOwner> owner = do_QueryInterface(frameElement);
      if (owner) {
        RefPtr<nsFrameLoader> currentFrameLoader = owner->GetFrameLoader();
        // It's possible that the frameloader owner has already moved on
        // and created a new frameloader. If so, we don't fire the event,
        // since the frameloader owner has clearly moved on.
        if (currentFrameLoader == frameLoader) {
          MessageChannel* channel = GetIPCChannel();
          if (channel && !channel->DoBuildIDsMatch()) {
            nsContentUtils::DispatchTrustedEvent(
                frameElement->OwnerDoc(), frameElement,
                NS_LITERAL_STRING("oop-browser-buildid-mismatch"),
                CanBubble::eYes, Cancelable::eYes);
          } else {
            nsContentUtils::DispatchTrustedEvent(
                frameElement->OwnerDoc(), frameElement,
                NS_LITERAL_STRING("oop-browser-crashed"), CanBubble::eYes,
                Cancelable::eYes);
          }
        }
      }
    }

    mFrameLoader = nullptr;
  }

  if (os) {
    os->NotifyObservers(NS_ISUPPORTS_CAST(nsITabParent*, this),
                        "ipc:browser-destroyed", nullptr);
  }
}

mozilla::ipc::IPCResult TabParent::RecvMoveFocus(
    const bool& aForward, const bool& aForDocumentNavigation) {
  nsCOMPtr<nsIFocusManager> fm = do_GetService(FOCUSMANAGER_CONTRACTID);
  if (fm) {
    RefPtr<Element> dummy;

    uint32_t type =
        aForward
            ? (aForDocumentNavigation
                   ? static_cast<uint32_t>(
                         nsIFocusManager::MOVEFOCUS_FORWARDDOC)
                   : static_cast<uint32_t>(nsIFocusManager::MOVEFOCUS_FORWARD))
            : (aForDocumentNavigation
                   ? static_cast<uint32_t>(
                         nsIFocusManager::MOVEFOCUS_BACKWARDDOC)
                   : static_cast<uint32_t>(
                         nsIFocusManager::MOVEFOCUS_BACKWARD));
    fm->MoveFocus(nullptr, mFrameElement, type, nsIFocusManager::FLAG_BYKEY,
                  getter_AddRefs(dummy));
  }
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvSizeShellTo(
    const uint32_t& aFlags, const int32_t& aWidth, const int32_t& aHeight,
    const int32_t& aShellItemWidth, const int32_t& aShellItemHeight) {
  NS_ENSURE_TRUE(mFrameElement, IPC_OK());

  nsCOMPtr<nsIDocShell> docShell = mFrameElement->OwnerDoc()->GetDocShell();
  NS_ENSURE_TRUE(docShell, IPC_OK());

  nsCOMPtr<nsIDocShellTreeOwner> treeOwner;
  nsresult rv = docShell->GetTreeOwner(getter_AddRefs(treeOwner));
  NS_ENSURE_SUCCESS(rv, IPC_OK());

  int32_t width = aWidth;
  int32_t height = aHeight;

  if (aFlags & nsIEmbeddingSiteWindow::DIM_FLAGS_IGNORE_CX) {
    width = mDimensions.width;
  }

  if (aFlags & nsIEmbeddingSiteWindow::DIM_FLAGS_IGNORE_CY) {
    height = mDimensions.height;
  }

  nsCOMPtr<nsIXULWindow> xulWin(do_GetInterface(treeOwner));
  NS_ENSURE_TRUE(xulWin, IPC_OK());
  xulWin->SizeShellToWithLimit(width, height, aShellItemWidth,
                               aShellItemHeight);

  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvDropLinks(nsTArray<nsString>&& aLinks) {
  nsCOMPtr<nsIBrowser> browser =
      mFrameElement ? mFrameElement->AsBrowser() : nullptr;
  if (browser) {
    // Verify that links have not been modified by the child. If links have
    // not been modified then it's safe to load those links using the
    // SystemPrincipal. If they have been modified by web content, then
    // we use a NullPrincipal which still allows to load web links.
    bool loadUsingSystemPrincipal = true;
    if (aLinks.Length() != mVerifyDropLinks.Length()) {
      loadUsingSystemPrincipal = false;
    }
    UniquePtr<const char16_t*[]> links;
    links = MakeUnique<const char16_t*[]>(aLinks.Length());
    for (uint32_t i = 0; i < aLinks.Length(); i++) {
      if (loadUsingSystemPrincipal) {
        if (!aLinks[i].Equals(mVerifyDropLinks[i])) {
          loadUsingSystemPrincipal = false;
        }
      }
      links[i] = aLinks[i].get();
    }
    mVerifyDropLinks.Clear();
    nsCOMPtr<nsIPrincipal> triggeringPrincipal;
    if (loadUsingSystemPrincipal) {
      triggeringPrincipal = nsContentUtils::GetSystemPrincipal();
    } else {
      triggeringPrincipal = NullPrincipal::CreateWithoutOriginAttributes();
    }
    browser->DropLinks(aLinks.Length(), links.get(), triggeringPrincipal);
  }
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvEvent(const RemoteDOMEvent& aEvent) {
  RefPtr<Event> event = aEvent.mEvent;
  NS_ENSURE_TRUE(event, IPC_OK());

  nsCOMPtr<mozilla::dom::EventTarget> target = mFrameElement;
  NS_ENSURE_TRUE(target, IPC_OK());

  event->SetOwner(target);

  target->DispatchEvent(*event);
  return IPC_OK();
}

bool TabParent::SendLoadRemoteScript(const nsString& aURL,
                                     const bool& aRunInGlobalScope) {
  if (mCreatingWindow) {
    mDelayedFrameScripts.AppendElement(
        FrameScriptInfo(aURL, aRunInGlobalScope));
    return true;
  }

  MOZ_ASSERT(mDelayedFrameScripts.IsEmpty());
  return PBrowserParent::SendLoadRemoteScript(aURL, aRunInGlobalScope);
}

void TabParent::LoadURL(nsIURI* aURI) {
  MOZ_ASSERT(aURI);

  if (mIsDestroyed) {
    return;
  }

  nsCString spec;
  aURI->GetSpec(spec);

  if (mCreatingWindow) {
    // Don't send the message if the child wants to load its own URL.
    MOZ_ASSERT(mDelayedURL.IsEmpty());
    mDelayedURL = spec;
    return;
  }

  Unused << SendLoadURL(spec, GetShowInfo());
}

void TabParent::InitRendering() {
  MOZ_ASSERT(!mRenderFrame.IsInitialized());
  mRenderFrame.Initialize(this);
  MOZ_ASSERT(mRenderFrame.IsInitialized());

  layers::LayersId layersId = mRenderFrame.GetLayersId();
  AddTabParentToTable(layersId, this);

  TextureFactoryIdentifier textureFactoryIdentifier;
  mRenderFrame.GetTextureFactoryIdentifier(&textureFactoryIdentifier);
  Unused << SendInitRendering(textureFactoryIdentifier, layersId,
                              mRenderFrame.GetCompositorOptions(),
                              mRenderFrame.IsLayersConnected());
}

void TabParent::MaybeShowFrame() {
  RefPtr<nsFrameLoader> frameLoader = GetFrameLoader();
  if (!frameLoader) {
    return;
  }
  frameLoader->MaybeShowFrame();
}

void TabParent::Show(const ScreenIntSize& size, bool aParentIsActive) {
  mDimensions = size;
  if (mIsDestroyed) {
    return;
  }

  MOZ_ASSERT(mRenderFrame.IsInitialized());

  nsCOMPtr<nsISupports> container = mFrameElement->OwnerDoc()->GetContainer();
  nsCOMPtr<nsIBaseWindow> baseWindow = do_QueryInterface(container);
  nsCOMPtr<nsIWidget> mainWidget;
  baseWindow->GetMainWidget(getter_AddRefs(mainWidget));
  mSizeMode = mainWidget ? mainWidget->SizeMode() : nsSizeMode_Normal;

  Unused << SendShow(size, GetShowInfo(), aParentIsActive, mSizeMode);
}

mozilla::ipc::IPCResult TabParent::RecvSetDimensions(const uint32_t& aFlags,
                                                     const int32_t& aX,
                                                     const int32_t& aY,
                                                     const int32_t& aCx,
                                                     const int32_t& aCy) {
  MOZ_ASSERT(!(aFlags & nsIEmbeddingSiteWindow::DIM_FLAGS_SIZE_INNER),
             "We should never see DIM_FLAGS_SIZE_INNER here!");

  NS_ENSURE_TRUE(mFrameElement, IPC_OK());
  nsCOMPtr<nsIDocShell> docShell = mFrameElement->OwnerDoc()->GetDocShell();
  NS_ENSURE_TRUE(docShell, IPC_OK());
  nsCOMPtr<nsIDocShellTreeOwner> treeOwner;
  docShell->GetTreeOwner(getter_AddRefs(treeOwner));
  nsCOMPtr<nsIBaseWindow> treeOwnerAsWin = do_QueryInterface(treeOwner);
  NS_ENSURE_TRUE(treeOwnerAsWin, IPC_OK());

  // We only care about the parameters that actually changed, see more
  // details in TabChild::SetDimensions.
  int32_t unused;
  int32_t x = aX;
  if (aFlags & nsIEmbeddingSiteWindow::DIM_FLAGS_IGNORE_X) {
    treeOwnerAsWin->GetPosition(&x, &unused);
  }

  int32_t y = aY;
  if (aFlags & nsIEmbeddingSiteWindow::DIM_FLAGS_IGNORE_Y) {
    treeOwnerAsWin->GetPosition(&unused, &y);
  }

  int32_t cx = aCx;
  if (aFlags & nsIEmbeddingSiteWindow::DIM_FLAGS_IGNORE_CX) {
    treeOwnerAsWin->GetSize(&cx, &unused);
  }

  int32_t cy = aCy;
  if (aFlags & nsIEmbeddingSiteWindow::DIM_FLAGS_IGNORE_CY) {
    treeOwnerAsWin->GetSize(&unused, &cy);
  }

  if (aFlags & nsIEmbeddingSiteWindow::DIM_FLAGS_POSITION &&
      aFlags & nsIEmbeddingSiteWindow::DIM_FLAGS_SIZE_OUTER) {
    treeOwnerAsWin->SetPositionAndSize(x, y, cx, cy, nsIBaseWindow::eRepaint);
    return IPC_OK();
  }

  if (aFlags & nsIEmbeddingSiteWindow::DIM_FLAGS_POSITION) {
    treeOwnerAsWin->SetPosition(x, y);
    mUpdatedDimensions = false;
    UpdatePosition();
    return IPC_OK();
  }

  if (aFlags & nsIEmbeddingSiteWindow::DIM_FLAGS_SIZE_OUTER) {
    treeOwnerAsWin->SetSize(cx, cy, true);
    return IPC_OK();
  }

  MOZ_ASSERT(false, "Unknown flags!");
  return IPC_FAIL_NO_REASON(this);
}

nsresult TabParent::UpdatePosition() {
  RefPtr<nsFrameLoader> frameLoader = GetFrameLoader();
  if (!frameLoader) {
    return NS_OK;
  }
  nsIntRect windowDims;
  NS_ENSURE_SUCCESS(frameLoader->GetWindowDimensions(windowDims),
                    NS_ERROR_FAILURE);
  UpdateDimensions(windowDims, mDimensions);
  return NS_OK;
}

void TabParent::UpdateDimensions(const nsIntRect& rect,
                                 const ScreenIntSize& size) {
  if (mIsDestroyed) {
    return;
  }
  nsCOMPtr<nsIWidget> widget = GetWidget();
  if (!widget) {
    NS_WARNING("No widget found in TabParent::UpdateDimensions");
    return;
  }

  hal::ScreenConfiguration config;
  hal::GetCurrentScreenConfiguration(&config);
  hal::ScreenOrientation orientation = config.orientation();
  LayoutDeviceIntPoint clientOffset = GetClientOffset();
  LayoutDeviceIntPoint chromeOffset = -GetChildProcessOffset();

  if (!mUpdatedDimensions || mOrientation != orientation ||
      mDimensions != size || !mRect.IsEqualEdges(rect) ||
      clientOffset != mClientOffset || chromeOffset != mChromeOffset) {
    mUpdatedDimensions = true;
    mRect = rect;
    mDimensions = size;
    mOrientation = orientation;
    mClientOffset = clientOffset;
    mChromeOffset = chromeOffset;

    Unused << SendUpdateDimensions(GetDimensionInfo());
  }
}

DimensionInfo TabParent::GetDimensionInfo() {
  nsCOMPtr<nsIWidget> widget = GetWidget();
  MOZ_ASSERT(widget);
  CSSToLayoutDeviceScale widgetScale = widget->GetDefaultScale();

  LayoutDeviceIntRect devicePixelRect = ViewAs<LayoutDevicePixel>(
      mRect, PixelCastJustification::LayoutDeviceIsScreenForTabDims);
  LayoutDeviceIntSize devicePixelSize = ViewAs<LayoutDevicePixel>(
      mDimensions, PixelCastJustification::LayoutDeviceIsScreenForTabDims);

  CSSRect unscaledRect = devicePixelRect / widgetScale;
  CSSSize unscaledSize = devicePixelSize / widgetScale;
  DimensionInfo di(unscaledRect, unscaledSize, mOrientation, mClientOffset,
                   mChromeOffset);
  return di;
}

void TabParent::SizeModeChanged(const nsSizeMode& aSizeMode) {
  if (!mIsDestroyed && aSizeMode != mSizeMode) {
    mSizeMode = aSizeMode;
    Unused << SendSizeModeChanged(aSizeMode);
  }
}

void TabParent::UIResolutionChanged() {
  if (!mIsDestroyed) {
    // TryCacheDPIAndScale()'s cache is keyed off of
    // mDPI being greater than 0, so this invalidates it.
    mDPI = -1;
    TryCacheDPIAndScale();
    // If mDPI was set to -1 to invalidate it and then TryCacheDPIAndScale
    // fails to cache the values, then mDefaultScale.scale might be invalid.
    // We don't want to send that value to content. Just send -1 for it too in
    // that case.
    Unused << SendUIResolutionChanged(mDPI, mRounding,
                                      mDPI < 0 ? -1.0 : mDefaultScale.scale);
  }
}

void TabParent::ThemeChanged() {
  if (!mIsDestroyed) {
    // The theme has changed, and any cached values we had sent down
    // to the child have been invalidated. When this method is called,
    // LookAndFeel should have the up-to-date values, which we now
    // send down to the child. We do this for every remote tab for now,
    // but bug 1156934 has been filed to do it once per content process.
    Unused << SendThemeChanged(LookAndFeel::GetIntCache());
  }
}

void TabParent::HandleAccessKey(const WidgetKeyboardEvent& aEvent,
                                nsTArray<uint32_t>& aCharCodes) {
  if (!mIsDestroyed) {
    // Note that we don't need to mark aEvent is posted to a remote process
    // because the event may be dispatched to it as normal keyboard event.
    // Therefore, we should use local copy to send it.
    WidgetKeyboardEvent localEvent(aEvent);
    Unused << SendHandleAccessKey(localEvent, aCharCodes);
  }
}

void TabParent::Activate() {
  if (!mIsDestroyed) {
    Unused << Manager()->SendActivate(this);
  }
}

void TabParent::Deactivate() {
  if (!mIsDestroyed) {
    Unused << Manager()->SendDeactivate(this);
  }
}

a11y::PDocAccessibleParent* TabParent::AllocPDocAccessibleParent(
    PDocAccessibleParent* aParent, const uint64_t&, const uint32_t&,
    const IAccessibleHolder&) {
#ifdef ACCESSIBILITY
  return new a11y::DocAccessibleParent();
#else
  return nullptr;
#endif
}

bool TabParent::DeallocPDocAccessibleParent(PDocAccessibleParent* aParent) {
#ifdef ACCESSIBILITY
  delete static_cast<a11y::DocAccessibleParent*>(aParent);
#endif
  return true;
}

mozilla::ipc::IPCResult TabParent::RecvPDocAccessibleConstructor(
    PDocAccessibleParent* aDoc, PDocAccessibleParent* aParentDoc,
    const uint64_t& aParentID, const uint32_t& aMsaaID,
    const IAccessibleHolder& aDocCOMProxy) {
#ifdef ACCESSIBILITY
  auto doc = static_cast<a11y::DocAccessibleParent*>(aDoc);

  // If this tab is already shutting down just mark the new actor as shutdown
  // and ignore it.  When the tab actor is destroyed it will be too.
  if (mIsDestroyed) {
    doc->MarkAsShutdown();
    return IPC_OK();
  }

  if (aParentDoc) {
    // A document should never directly be the parent of another document.
    // There should always be an outer doc accessible child of the outer
    // document containing the child.
    MOZ_ASSERT(aParentID);
    if (!aParentID) {
      return IPC_FAIL_NO_REASON(this);
    }

    auto parentDoc = static_cast<a11y::DocAccessibleParent*>(aParentDoc);
    mozilla::ipc::IPCResult added = parentDoc->AddChildDoc(doc, aParentID);
    if (!added) {
#  ifdef DEBUG
      return added;
#  else
      return IPC_OK();
#  endif
    }

#  ifdef XP_WIN
    MOZ_ASSERT(aDocCOMProxy.IsNull());
    a11y::WrapperFor(doc)->SetID(aMsaaID);
    if (a11y::nsWinUtils::IsWindowEmulationStarted()) {
      doc->SetEmulatedWindowHandle(parentDoc->GetEmulatedWindowHandle());
    }
#  endif

    return IPC_OK();
  } else {
    // null aParentDoc means this document is at the top level in the child
    // process.  That means it makes no sense to get an id for an accessible
    // that is its parent.
    MOZ_ASSERT(!aParentID);
    if (aParentID) {
      return IPC_FAIL_NO_REASON(this);
    }

    doc->SetTopLevel();
    a11y::DocManager::RemoteDocAdded(doc);
#  ifdef XP_WIN
    a11y::WrapperFor(doc)->SetID(aMsaaID);
    MOZ_ASSERT(!aDocCOMProxy.IsNull());

    RefPtr<IAccessible> proxy(aDocCOMProxy.Get());
    doc->SetCOMInterface(proxy);
    doc->MaybeInitWindowEmulation();
    doc->SendParentCOMProxy();
#  endif
  }
#endif
  return IPC_OK();
}

a11y::DocAccessibleParent* TabParent::GetTopLevelDocAccessible() const {
#ifdef ACCESSIBILITY
  // XXX Consider managing non top level PDocAccessibles with their parent
  // document accessible.
  const ManagedContainer<PDocAccessibleParent>& docs =
      ManagedPDocAccessibleParent();
  for (auto iter = docs.ConstIter(); !iter.Done(); iter.Next()) {
    auto doc = static_cast<a11y::DocAccessibleParent*>(iter.Get()->GetKey());
    if (doc->IsTopLevel()) {
      return doc;
    }
  }

  MOZ_ASSERT(docs.Count() == 0,
             "If there isn't a top level accessible doc "
             "there shouldn't be an accessible doc at all!");
#endif
  return nullptr;
}

PFilePickerParent* TabParent::AllocPFilePickerParent(const nsString& aTitle,
                                                     const int16_t& aMode) {
  return new FilePickerParent(aTitle, aMode);
}

bool TabParent::DeallocPFilePickerParent(PFilePickerParent* actor) {
  delete actor;
  return true;
}

auto TabParent::AllocPIndexedDBPermissionRequestParent(
    const Principal& aPrincipal) -> PIndexedDBPermissionRequestParent* {
  MOZ_ASSERT(NS_IsMainThread());

  nsCOMPtr<nsIPrincipal> principal(aPrincipal);
  if (!principal) {
    return nullptr;
  }

  nsCOMPtr<nsIContentParent> manager = Manager();
  if (!manager->IsContentParent()) {
    MOZ_CRASH("Figure out security checks for bridged content!");
  }

  if (NS_WARN_IF(!mFrameElement)) {
    return nullptr;
  }

  return mozilla::dom::indexedDB::AllocPIndexedDBPermissionRequestParent(
      mFrameElement, principal);
}

mozilla::ipc::IPCResult TabParent::RecvPIndexedDBPermissionRequestConstructor(
    PIndexedDBPermissionRequestParent* aActor, const Principal& aPrincipal) {
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(aActor);

  if (!mozilla::dom::indexedDB::RecvPIndexedDBPermissionRequestConstructor(
          aActor)) {
    return IPC_FAIL_NO_REASON(this);
  }
  return IPC_OK();
}

bool TabParent::DeallocPIndexedDBPermissionRequestParent(
    PIndexedDBPermissionRequestParent* aActor) {
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(aActor);

  return mozilla::dom::indexedDB::DeallocPIndexedDBPermissionRequestParent(
      aActor);
}

IPCResult TabParent::RecvPWindowGlobalConstructor(
    PWindowGlobalParent* aActor, const WindowGlobalInit& aInit) {
  static_cast<WindowGlobalParent*>(aActor)->Init(aInit);
  return IPC_OK();
}

PWindowGlobalParent* TabParent::AllocPWindowGlobalParent(
    const WindowGlobalInit& aInit) {
  // Reference freed in DeallocPWindowGlobalParent.
  return do_AddRef(new WindowGlobalParent(aInit, /* inproc */ false)).take();
}

bool TabParent::DeallocPWindowGlobalParent(PWindowGlobalParent* aActor) {
  // Free reference from AllocPWindowGlobalParent.
  static_cast<WindowGlobalParent*>(aActor)->Release();
  return true;
}

IPCResult TabParent::RecvPRemoteFrameConstructor(PRemoteFrameParent* aActor,
                                                 const nsString& aName,
                                                 const nsString& aRemoteType) {
  static_cast<RemoteFrameParent*>(aActor)->Init(aName, aRemoteType);
  return IPC_OK();
}

PRemoteFrameParent* TabParent::AllocPRemoteFrameParent(
    const nsString& aName, const nsString& aRemoteType) {
  // Reference freed in DeallocPRemoteFrameParent.
  return do_AddRef(new RemoteFrameParent()).take();
}

bool TabParent::DeallocPRemoteFrameParent(PRemoteFrameParent* aActor) {
  // Free reference from AllocPRemoteFrameParent.
  static_cast<RemoteFrameParent*>(aActor)->Release();
  return true;
}

void TabParent::SendMouseEvent(const nsAString& aType, float aX, float aY,
                               int32_t aButton, int32_t aClickCount,
                               int32_t aModifiers,
                               bool aIgnoreRootScrollFrame) {
  if (!mIsDestroyed) {
    Unused << PBrowserParent::SendMouseEvent(nsString(aType), aX, aY, aButton,
                                             aClickCount, aModifiers,
                                             aIgnoreRootScrollFrame);
  }
}

void TabParent::SendRealMouseEvent(WidgetMouseEvent& aEvent) {
  if (mIsDestroyed) {
    return;
  }
  aEvent.mRefPoint += GetChildProcessOffset();

  nsCOMPtr<nsIWidget> widget = GetWidget();
  if (widget) {
    // When we mouseenter the tab, the tab's cursor should
    // become the current cursor.  When we mouseexit, we stop.
    if (eMouseEnterIntoWidget == aEvent.mMessage) {
      mTabSetsCursor = true;
      if (mCursor != eCursorInvalid) {
        widget->SetCursor(mCursor, mCustomCursor, mCustomCursorHotspotX,
                          mCustomCursorHotspotY);
      }
    } else if (eMouseExitFromWidget == aEvent.mMessage) {
      mTabSetsCursor = false;
    }
  }
  if (!mIsReadyToHandleInputEvents) {
    if (eMouseEnterIntoWidget == aEvent.mMessage) {
      mIsMouseEnterIntoWidgetEventSuppressed = true;
    } else if (eMouseExitFromWidget == aEvent.mMessage) {
      mIsMouseEnterIntoWidgetEventSuppressed = false;
    }
    return;
  }

  ScrollableLayerGuid guid;
  uint64_t blockId;
  ApzAwareEventRoutingToChild(&guid, &blockId, nullptr);

  bool isInputPriorityEventEnabled =
      Manager()->AsContentParent()->IsInputPriorityEventEnabled();

  if (mIsMouseEnterIntoWidgetEventSuppressed) {
    // In the case that the TabParent suppressed the eMouseEnterWidget event due
    // to its corresponding TabChild wasn't ready to handle it, we have to
    // resend it when the TabChild is ready.
    mIsMouseEnterIntoWidgetEventSuppressed = false;
    WidgetMouseEvent localEvent(aEvent);
    localEvent.mMessage = eMouseEnterIntoWidget;
    DebugOnly<bool> ret =
        isInputPriorityEventEnabled
            ? SendRealMouseButtonEvent(localEvent, guid, blockId)
            : SendNormalPriorityRealMouseButtonEvent(localEvent, guid, blockId);
    NS_WARNING_ASSERTION(
        ret, "SendRealMouseButtonEvent(eMouseEnterIntoWidget) failed");
    MOZ_ASSERT(!ret || localEvent.HasBeenPostedToRemoteProcess());
  }

  if (eMouseMove == aEvent.mMessage) {
    if (aEvent.mReason == WidgetMouseEvent::eSynthesized) {
      DebugOnly<bool> ret =
          isInputPriorityEventEnabled
              ? SendSynthMouseMoveEvent(aEvent, guid, blockId)
              : SendNormalPrioritySynthMouseMoveEvent(aEvent, guid, blockId);
      NS_WARNING_ASSERTION(ret, "SendSynthMouseMoveEvent() failed");
      MOZ_ASSERT(!ret || aEvent.HasBeenPostedToRemoteProcess());
      return;
    }
    DebugOnly<bool> ret =
        isInputPriorityEventEnabled
            ? SendRealMouseMoveEvent(aEvent, guid, blockId)
            : SendNormalPriorityRealMouseMoveEvent(aEvent, guid, blockId);
    NS_WARNING_ASSERTION(ret, "SendRealMouseMoveEvent() failed");
    MOZ_ASSERT(!ret || aEvent.HasBeenPostedToRemoteProcess());
    return;
  }

  DebugOnly<bool> ret =
      isInputPriorityEventEnabled
          ? SendRealMouseButtonEvent(aEvent, guid, blockId)
          : SendNormalPriorityRealMouseButtonEvent(aEvent, guid, blockId);
  NS_WARNING_ASSERTION(ret, "SendRealMouseButtonEvent() failed");
  MOZ_ASSERT(!ret || aEvent.HasBeenPostedToRemoteProcess());
}

LayoutDeviceToCSSScale TabParent::GetLayoutDeviceToCSSScale() {
  Document* doc = (mFrameElement ? mFrameElement->OwnerDoc() : nullptr);
  nsPresContext* ctx = (doc ? doc->GetPresContext() : nullptr);
  return LayoutDeviceToCSSScale(
      ctx ? (float)ctx->AppUnitsPerDevPixel() / AppUnitsPerCSSPixel() : 0.0f);
}

bool TabParent::QueryDropLinksForVerification() {
  // Before sending the dragEvent, we query the links being dragged and
  // store them on the parent, to make sure the child can not modify links.
  nsCOMPtr<nsIDragSession> dragSession = nsContentUtils::GetDragSession();
  if (!dragSession) {
    NS_WARNING("No dragSession to query links for verification");
    return false;
  }

  RefPtr<DataTransfer> initialDataTransfer = dragSession->GetDataTransfer();
  if (!initialDataTransfer) {
    NS_WARNING("No initialDataTransfer to query links for verification");
    return false;
  }

  nsCOMPtr<nsIDroppedLinkHandler> dropHandler =
      do_GetService("@mozilla.org/content/dropped-link-handler;1");
  if (!dropHandler) {
    NS_WARNING("No dropHandler to query links for verification");
    return false;
  }

  // No more than one drop event can happen simultaneously; reset the link
  // verification array and store all links that are being dragged.
  mVerifyDropLinks.Clear();

  uint32_t linksCount = 0;
  nsIDroppedLinkItem** droppedLinkedItems = nullptr;
  dropHandler->QueryLinks(initialDataTransfer, &linksCount,
                          &droppedLinkedItems);

  // Since the entire event is cancelled if one of the links is invalid,
  // we can store all links on the parent side without any prior
  // validation checks.
  nsresult rv = NS_OK;
  for (uint32_t i = 0; i < linksCount; i++) {
    nsString tmp;
    rv = droppedLinkedItems[i]->GetUrl(tmp);
    if (NS_FAILED(rv)) {
      NS_WARNING("Failed to query url for verification");
      break;
    }
    mVerifyDropLinks.AppendElement(tmp);

    rv = droppedLinkedItems[i]->GetName(tmp);
    if (NS_FAILED(rv)) {
      NS_WARNING("Failed to query name for verification");
      break;
    }
    mVerifyDropLinks.AppendElement(tmp);

    rv = droppedLinkedItems[i]->GetType(tmp);
    if (NS_FAILED(rv)) {
      NS_WARNING("Failed to query type for verification");
      break;
    }
    mVerifyDropLinks.AppendElement(tmp);
  }
  for (uint32_t i = 0; i < linksCount; i++) {
    NS_IF_RELEASE(droppedLinkedItems[i]);
  }
  free(droppedLinkedItems);
  if (NS_FAILED(rv)) {
    mVerifyDropLinks.Clear();
    return false;
  }
  return true;
}

void TabParent::SendRealDragEvent(WidgetDragEvent& aEvent, uint32_t aDragAction,
                                  uint32_t aDropEffect,
                                  const IPC::Principal& aPrincipal) {
  if (mIsDestroyed || !mIsReadyToHandleInputEvents) {
    return;
  }
  MOZ_ASSERT(!Manager()->AsContentParent()->IsInputPriorityEventEnabled());
  aEvent.mRefPoint += GetChildProcessOffset();
  if (aEvent.mMessage == eDrop) {
    if (!QueryDropLinksForVerification()) {
      return;
    }
  }
  DebugOnly<bool> ret = PBrowserParent::SendRealDragEvent(
      aEvent, aDragAction, aDropEffect, aPrincipal);
  NS_WARNING_ASSERTION(ret, "PBrowserParent::SendRealDragEvent() failed");
  MOZ_ASSERT(!ret || aEvent.HasBeenPostedToRemoteProcess());
}

LayoutDevicePoint TabParent::AdjustTapToChildWidget(
    const LayoutDevicePoint& aPoint) {
  return aPoint + LayoutDevicePoint(GetChildProcessOffset());
}

void TabParent::SendMouseWheelEvent(WidgetWheelEvent& aEvent) {
  if (mIsDestroyed || !mIsReadyToHandleInputEvents) {
    return;
  }

  ScrollableLayerGuid guid;
  uint64_t blockId;
  ApzAwareEventRoutingToChild(&guid, &blockId, nullptr);
  aEvent.mRefPoint += GetChildProcessOffset();
  DebugOnly<bool> ret =
      Manager()->AsContentParent()->IsInputPriorityEventEnabled()
          ? PBrowserParent::SendMouseWheelEvent(aEvent, guid, blockId)
          : PBrowserParent::SendNormalPriorityMouseWheelEvent(aEvent, guid,
                                                              blockId);

  NS_WARNING_ASSERTION(ret, "PBrowserParent::SendMouseWheelEvent() failed");
  MOZ_ASSERT(!ret || aEvent.HasBeenPostedToRemoteProcess());
}

mozilla::ipc::IPCResult TabParent::RecvDispatchWheelEvent(
    const mozilla::WidgetWheelEvent& aEvent) {
  nsCOMPtr<nsIWidget> widget = GetWidget();
  if (!widget) {
    return IPC_OK();
  }

  WidgetWheelEvent localEvent(aEvent);
  localEvent.mWidget = widget;
  localEvent.mRefPoint -= GetChildProcessOffset();

  widget->DispatchInputEvent(&localEvent);
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvDispatchMouseEvent(
    const mozilla::WidgetMouseEvent& aEvent) {
  nsCOMPtr<nsIWidget> widget = GetWidget();
  if (!widget) {
    return IPC_OK();
  }

  WidgetMouseEvent localEvent(aEvent);
  localEvent.mWidget = widget;
  localEvent.mRefPoint -= GetChildProcessOffset();

  widget->DispatchInputEvent(&localEvent);
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvDispatchKeyboardEvent(
    const mozilla::WidgetKeyboardEvent& aEvent) {
  nsCOMPtr<nsIWidget> widget = GetWidget();
  if (!widget) {
    return IPC_OK();
  }

  WidgetKeyboardEvent localEvent(aEvent);
  localEvent.mWidget = widget;
  localEvent.mRefPoint -= GetChildProcessOffset();

  widget->DispatchInputEvent(&localEvent);
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvRequestNativeKeyBindings(
    const uint32_t& aType, const WidgetKeyboardEvent& aEvent,
    nsTArray<CommandInt>* aCommands) {
  MOZ_ASSERT(aCommands);
  MOZ_ASSERT(aCommands->IsEmpty());

  nsIWidget::NativeKeyBindingsType keyBindingsType =
      static_cast<nsIWidget::NativeKeyBindingsType>(aType);
  switch (keyBindingsType) {
    case nsIWidget::NativeKeyBindingsForSingleLineEditor:
    case nsIWidget::NativeKeyBindingsForMultiLineEditor:
    case nsIWidget::NativeKeyBindingsForRichTextEditor:
      break;
    default:
      return IPC_FAIL(this, "Invalid aType value");
  }

  nsCOMPtr<nsIWidget> widget = GetWidget();
  if (!widget) {
    return IPC_OK();
  }

  WidgetKeyboardEvent localEvent(aEvent);
  localEvent.mWidget = widget;

  if (NS_FAILED(widget->AttachNativeKeyEvent(localEvent))) {
    return IPC_OK();
  }

  localEvent.InitEditCommandsFor(keyBindingsType);
  *aCommands = localEvent.EditCommandsConstRef(keyBindingsType);

  return IPC_OK();
}

class SynthesizedEventObserver : public nsIObserver {
  NS_DECL_ISUPPORTS

 public:
  SynthesizedEventObserver(TabParent* aTabParent, const uint64_t& aObserverId)
      : mTabParent(aTabParent), mObserverId(aObserverId) {
    MOZ_ASSERT(mTabParent);
  }

  NS_IMETHOD Observe(nsISupports* aSubject, const char* aTopic,
                     const char16_t* aData) override {
    if (!mTabParent || !mObserverId) {
      // We already sent the notification, or we don't actually need to
      // send any notification at all.
      return NS_OK;
    }

    if (!mTabParent->SendNativeSynthesisResponse(mObserverId,
                                                 nsCString(aTopic))) {
      NS_WARNING("Unable to send native event synthesization response!");
    }
    // Null out tabparent to indicate we already sent the response
    mTabParent = nullptr;
    return NS_OK;
  }

 private:
  virtual ~SynthesizedEventObserver() {}

  RefPtr<TabParent> mTabParent;
  uint64_t mObserverId;
};

NS_IMPL_ISUPPORTS(SynthesizedEventObserver, nsIObserver)

class MOZ_STACK_CLASS AutoSynthesizedEventResponder {
 public:
  AutoSynthesizedEventResponder(TabParent* aTabParent,
                                const uint64_t& aObserverId, const char* aTopic)
      : mObserver(new SynthesizedEventObserver(aTabParent, aObserverId)),
        mTopic(aTopic) {}

  ~AutoSynthesizedEventResponder() {
    // This may be a no-op if the observer already sent a response.
    mObserver->Observe(nullptr, mTopic, nullptr);
  }

  nsIObserver* GetObserver() { return mObserver; }

 private:
  nsCOMPtr<nsIObserver> mObserver;
  const char* mTopic;
};

mozilla::ipc::IPCResult TabParent::RecvSynthesizeNativeKeyEvent(
    const int32_t& aNativeKeyboardLayout, const int32_t& aNativeKeyCode,
    const uint32_t& aModifierFlags, const nsString& aCharacters,
    const nsString& aUnmodifiedCharacters, const uint64_t& aObserverId) {
  AutoSynthesizedEventResponder responder(this, aObserverId, "keyevent");
  nsCOMPtr<nsIWidget> widget = GetWidget();
  if (widget) {
    widget->SynthesizeNativeKeyEvent(
        aNativeKeyboardLayout, aNativeKeyCode, aModifierFlags, aCharacters,
        aUnmodifiedCharacters, responder.GetObserver());
  }
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvSynthesizeNativeMouseEvent(
    const LayoutDeviceIntPoint& aPoint, const uint32_t& aNativeMessage,
    const uint32_t& aModifierFlags, const uint64_t& aObserverId) {
  AutoSynthesizedEventResponder responder(this, aObserverId, "mouseevent");
  nsCOMPtr<nsIWidget> widget = GetWidget();
  if (widget) {
    widget->SynthesizeNativeMouseEvent(aPoint, aNativeMessage, aModifierFlags,
                                       responder.GetObserver());
  }
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvSynthesizeNativeMouseMove(
    const LayoutDeviceIntPoint& aPoint, const uint64_t& aObserverId) {
  AutoSynthesizedEventResponder responder(this, aObserverId, "mousemove");
  nsCOMPtr<nsIWidget> widget = GetWidget();
  if (widget) {
    widget->SynthesizeNativeMouseMove(aPoint, responder.GetObserver());
  }
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvSynthesizeNativeMouseScrollEvent(
    const LayoutDeviceIntPoint& aPoint, const uint32_t& aNativeMessage,
    const double& aDeltaX, const double& aDeltaY, const double& aDeltaZ,
    const uint32_t& aModifierFlags, const uint32_t& aAdditionalFlags,
    const uint64_t& aObserverId) {
  AutoSynthesizedEventResponder responder(this, aObserverId,
                                          "mousescrollevent");
  nsCOMPtr<nsIWidget> widget = GetWidget();
  if (widget) {
    widget->SynthesizeNativeMouseScrollEvent(
        aPoint, aNativeMessage, aDeltaX, aDeltaY, aDeltaZ, aModifierFlags,
        aAdditionalFlags, responder.GetObserver());
  }
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvSynthesizeNativeTouchPoint(
    const uint32_t& aPointerId, const TouchPointerState& aPointerState,
    const LayoutDeviceIntPoint& aPoint, const double& aPointerPressure,
    const uint32_t& aPointerOrientation, const uint64_t& aObserverId) {
  AutoSynthesizedEventResponder responder(this, aObserverId, "touchpoint");
  nsCOMPtr<nsIWidget> widget = GetWidget();
  if (widget) {
    widget->SynthesizeNativeTouchPoint(aPointerId, aPointerState, aPoint,
                                       aPointerPressure, aPointerOrientation,
                                       responder.GetObserver());
  }
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvSynthesizeNativeTouchTap(
    const LayoutDeviceIntPoint& aPoint, const bool& aLongTap,
    const uint64_t& aObserverId) {
  AutoSynthesizedEventResponder responder(this, aObserverId, "touchtap");
  nsCOMPtr<nsIWidget> widget = GetWidget();
  if (widget) {
    widget->SynthesizeNativeTouchTap(aPoint, aLongTap, responder.GetObserver());
  }
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvClearNativeTouchSequence(
    const uint64_t& aObserverId) {
  AutoSynthesizedEventResponder responder(this, aObserverId, "cleartouch");
  nsCOMPtr<nsIWidget> widget = GetWidget();
  if (widget) {
    widget->ClearNativeTouchSequence(responder.GetObserver());
  }
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvSetPrefersReducedMotionOverrideForTest(
    const bool& aValue) {
  nsCOMPtr<nsIWidget> widget = GetWidget();
  if (widget) {
    widget->SetPrefersReducedMotionOverrideForTest(aValue);
  }
  return IPC_OK();
}

mozilla::ipc::IPCResult
TabParent::RecvResetPrefersReducedMotionOverrideForTest() {
  nsCOMPtr<nsIWidget> widget = GetWidget();
  if (widget) {
    widget->ResetPrefersReducedMotionOverrideForTest();
  }
  return IPC_OK();
}

void TabParent::SendRealKeyEvent(WidgetKeyboardEvent& aEvent) {
  if (mIsDestroyed || !mIsReadyToHandleInputEvents) {
    return;
  }
  aEvent.mRefPoint += GetChildProcessOffset();

  if (aEvent.mMessage == eKeyPress) {
    // XXX Should we do this only when input context indicates an editor having
    //     focus and the key event won't cause inputting text?
    aEvent.InitAllEditCommands();
  } else {
    aEvent.PreventNativeKeyBindings();
  }
  DebugOnly<bool> ret =
      Manager()->AsContentParent()->IsInputPriorityEventEnabled()
          ? PBrowserParent::SendRealKeyEvent(aEvent)
          : PBrowserParent::SendNormalPriorityRealKeyEvent(aEvent);

  NS_WARNING_ASSERTION(ret, "PBrowserParent::SendRealKeyEvent() failed");
  MOZ_ASSERT(!ret || aEvent.HasBeenPostedToRemoteProcess());
}

void TabParent::SendRealTouchEvent(WidgetTouchEvent& aEvent) {
  if (mIsDestroyed || !mIsReadyToHandleInputEvents) {
    return;
  }

  // PresShell::HandleEventInternal adds touches on touch end/cancel.  This
  // confuses remote content and the panning and zooming logic into thinking
  // that the added touches are part of the touchend/cancel, when actually
  // they're not.
  if (aEvent.mMessage == eTouchEnd || aEvent.mMessage == eTouchCancel) {
    for (int i = aEvent.mTouches.Length() - 1; i >= 0; i--) {
      if (!aEvent.mTouches[i]->mChanged) {
        aEvent.mTouches.RemoveElementAt(i);
      }
    }
  }

  ScrollableLayerGuid guid;
  uint64_t blockId;
  nsEventStatus apzResponse;
  ApzAwareEventRoutingToChild(&guid, &blockId, &apzResponse);

  if (mIsDestroyed) {
    return;
  }

  LayoutDeviceIntPoint offset = GetChildProcessOffset();
  for (uint32_t i = 0; i < aEvent.mTouches.Length(); i++) {
    aEvent.mTouches[i]->mRefPoint += offset;
  }

  bool inputPriorityEventEnabled =
      Manager()->AsContentParent()->IsInputPriorityEventEnabled();

  if (aEvent.mMessage == eTouchMove) {
    DebugOnly<bool> ret =
        inputPriorityEventEnabled
            ? PBrowserParent::SendRealTouchMoveEvent(aEvent, guid, blockId,
                                                     apzResponse)
            : PBrowserParent::SendNormalPriorityRealTouchMoveEvent(
                  aEvent, guid, blockId, apzResponse);

    NS_WARNING_ASSERTION(ret,
                         "PBrowserParent::SendRealTouchMoveEvent() failed");
    MOZ_ASSERT(!ret || aEvent.HasBeenPostedToRemoteProcess());
    return;
  }
  DebugOnly<bool> ret = inputPriorityEventEnabled
                            ? PBrowserParent::SendRealTouchEvent(
                                  aEvent, guid, blockId, apzResponse)
                            : PBrowserParent::SendNormalPriorityRealTouchEvent(
                                  aEvent, guid, blockId, apzResponse);

  NS_WARNING_ASSERTION(ret, "PBrowserParent::SendRealTouchEvent() failed");
  MOZ_ASSERT(!ret || aEvent.HasBeenPostedToRemoteProcess());
}

void TabParent::SendPluginEvent(WidgetPluginEvent& aEvent) {
  DebugOnly<bool> ret = PBrowserParent::SendPluginEvent(aEvent);
  NS_WARNING_ASSERTION(ret, "PBrowserParent::SendPluginEvent() failed");
  MOZ_ASSERT(!ret || aEvent.HasBeenPostedToRemoteProcess());
}

bool TabParent::SendHandleTap(TapType aType, const LayoutDevicePoint& aPoint,
                              Modifiers aModifiers,
                              const ScrollableLayerGuid& aGuid,
                              uint64_t aInputBlockId) {
  if (mIsDestroyed || !mIsReadyToHandleInputEvents) {
    return false;
  }
  if ((aType == TapType::eSingleTap || aType == TapType::eSecondTap)) {
    nsIFocusManager* fm = nsFocusManager::GetFocusManager();
    if (fm) {
      RefPtr<nsFrameLoader> frameLoader = GetFrameLoader();
      if (frameLoader) {
        RefPtr<Element> element = frameLoader->GetOwnerContent();
        if (element) {
          fm->SetFocus(element, nsIFocusManager::FLAG_BYMOUSE |
                                    nsIFocusManager::FLAG_BYTOUCH |
                                    nsIFocusManager::FLAG_NOSCROLL);
        }
      }
    }
  }
  LayoutDeviceIntPoint offset = GetChildProcessOffset();
  return Manager()->AsContentParent()->IsInputPriorityEventEnabled()
             ? PBrowserParent::SendHandleTap(aType, aPoint + offset, aModifiers,
                                             aGuid, aInputBlockId)
             : PBrowserParent::SendNormalPriorityHandleTap(
                   aType, aPoint + offset, aModifiers, aGuid, aInputBlockId);
}

mozilla::ipc::IPCResult TabParent::RecvSyncMessage(
    const nsString& aMessage, const ClonedMessageData& aData,
    InfallibleTArray<CpowEntry>&& aCpows, const IPC::Principal& aPrincipal,
    nsTArray<StructuredCloneData>* aRetVal) {
  AUTO_PROFILER_LABEL_DYNAMIC_LOSSY_NSSTRING("TabParent::RecvSyncMessage",
                                             OTHER, aMessage);
  MMPrinter::Print("TabParent::RecvSyncMessage", aMessage, aData);

  StructuredCloneData data;
  ipc::UnpackClonedMessageDataForParent(aData, data);

  CrossProcessCpowHolder cpows(Manager(), aCpows);
  if (!ReceiveMessage(aMessage, true, &data, &cpows, aPrincipal, aRetVal)) {
    return IPC_FAIL_NO_REASON(this);
  }
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvRpcMessage(
    const nsString& aMessage, const ClonedMessageData& aData,
    InfallibleTArray<CpowEntry>&& aCpows, const IPC::Principal& aPrincipal,
    nsTArray<StructuredCloneData>* aRetVal) {
  AUTO_PROFILER_LABEL_DYNAMIC_LOSSY_NSSTRING("TabParent::RecvRpcMessage", OTHER,
                                             aMessage);
  MMPrinter::Print("TabParent::RecvRpcMessage", aMessage, aData);

  StructuredCloneData data;
  ipc::UnpackClonedMessageDataForParent(aData, data);

  CrossProcessCpowHolder cpows(Manager(), aCpows);
  if (!ReceiveMessage(aMessage, true, &data, &cpows, aPrincipal, aRetVal)) {
    return IPC_FAIL_NO_REASON(this);
  }
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvAsyncMessage(
    const nsString& aMessage, InfallibleTArray<CpowEntry>&& aCpows,
    const IPC::Principal& aPrincipal, const ClonedMessageData& aData) {
  AUTO_PROFILER_LABEL_DYNAMIC_LOSSY_NSSTRING("TabParent::RecvAsyncMessage",
                                             OTHER, aMessage);
  MMPrinter::Print("TabParent::RecvAsyncMessage", aMessage, aData);

  StructuredCloneData data;
  ipc::UnpackClonedMessageDataForParent(aData, data);

  CrossProcessCpowHolder cpows(Manager(), aCpows);
  if (!ReceiveMessage(aMessage, false, &data, &cpows, aPrincipal, nullptr)) {
    return IPC_FAIL_NO_REASON(this);
  }
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvSetCursor(
    const nsCursor& aCursor, const bool& aHasCustomCursor,
    const nsCString& aCursorData, const uint32_t& aWidth,
    const uint32_t& aHeight, const uint32_t& aStride,
    const gfx::SurfaceFormat& aFormat, const uint32_t& aHotspotX,
    const uint32_t& aHotspotY, const bool& aForce) {
  nsCOMPtr<nsIWidget> widget = GetWidget();
  if (!widget) {
    return IPC_OK();
  }

  if (aForce) {
    widget->ClearCachedCursor();
  }

  if (!mTabSetsCursor) {
    return IPC_OK();
  }

  nsCOMPtr<imgIContainer> cursorImage;
  if (aHasCustomCursor) {
    if (aHeight * aStride != aCursorData.Length() ||
        aStride < aWidth * gfx::BytesPerPixel(aFormat)) {
      return IPC_FAIL(this, "Invalid custom cursor data");
    }
    const gfx::IntSize size(aWidth, aHeight);
    RefPtr<gfx::DataSourceSurface> customCursor =
        gfx::CreateDataSourceSurfaceFromData(
            size, aFormat,
            reinterpret_cast<const uint8_t*>(aCursorData.BeginReading()),
            aStride);

    RefPtr<gfxDrawable> drawable = new gfxSurfaceDrawable(customCursor, size);
    cursorImage = image::ImageOps::CreateFromDrawable(drawable);
  }

  widget->SetCursor(aCursor, cursorImage, aHotspotX, aHotspotY);
  mCursor = aCursor;
  mCustomCursor = cursorImage;
  mCustomCursorHotspotX = aHotspotX;
  mCustomCursorHotspotY = aHotspotY;

  return IPC_OK();
}

nsIXULBrowserWindow* TabParent::GetXULBrowserWindow() {
  if (!mFrameElement) {
    return nullptr;
  }

  nsCOMPtr<nsIDocShell> docShell = mFrameElement->OwnerDoc()->GetDocShell();
  if (!docShell) {
    return nullptr;
  }

  nsCOMPtr<nsIDocShellTreeOwner> treeOwner;
  docShell->GetTreeOwner(getter_AddRefs(treeOwner));
  if (!treeOwner) {
    return nullptr;
  }

  nsCOMPtr<nsIXULWindow> window = do_GetInterface(treeOwner);
  if (!window) {
    return nullptr;
  }

  nsCOMPtr<nsIXULBrowserWindow> xulBrowserWindow;
  window->GetXULBrowserWindow(getter_AddRefs(xulBrowserWindow));
  return xulBrowserWindow;
}

mozilla::ipc::IPCResult TabParent::RecvSetStatus(const uint32_t& aType,
                                                 const nsString& aStatus) {
  nsCOMPtr<nsIXULBrowserWindow> xulBrowserWindow = GetXULBrowserWindow();
  if (!xulBrowserWindow) {
    return IPC_OK();
  }

  switch (aType) {
    case nsIWebBrowserChrome::STATUS_LINK:
      xulBrowserWindow->SetOverLink(aStatus, nullptr);
      break;
  }
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvShowTooltip(const uint32_t& aX,
                                                   const uint32_t& aY,
                                                   const nsString& aTooltip,
                                                   const nsString& aDirection) {
  nsCOMPtr<nsIXULBrowserWindow> xulBrowserWindow = GetXULBrowserWindow();
  if (!xulBrowserWindow) {
    return IPC_OK();
  }

  nsCOMPtr<nsIFrameLoaderOwner> frame = do_QueryInterface(mFrameElement);
  if (!frame) return IPC_OK();

  xulBrowserWindow->ShowTooltip(aX, aY, aTooltip, aDirection, frame);
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvHideTooltip() {
  nsCOMPtr<nsIXULBrowserWindow> xulBrowserWindow = GetXULBrowserWindow();
  if (!xulBrowserWindow) {
    return IPC_OK();
  }

  xulBrowserWindow->HideTooltip();
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvNotifyIMEFocus(
    const ContentCache& aContentCache, const IMENotification& aIMENotification,
    NotifyIMEFocusResolver&& aResolve) {
  if (mIsDestroyed) {
    return IPC_OK();
  }

  nsCOMPtr<nsIWidget> widget = GetDocWidget();
  if (!widget) {
    aResolve(IMENotificationRequests());
    return IPC_OK();
  }

  mContentCache.AssignContent(aContentCache, widget, &aIMENotification);
  IMEStateManager::NotifyIME(aIMENotification, widget, this);

  IMENotificationRequests requests;
  if (aIMENotification.mMessage == NOTIFY_IME_OF_FOCUS) {
    requests = widget->IMENotificationRequestsRef();
  }
  aResolve(requests);

  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvNotifyIMETextChange(
    const ContentCache& aContentCache,
    const IMENotification& aIMENotification) {
  nsCOMPtr<nsIWidget> widget = GetDocWidget();
  if (!widget || !IMEStateManager::DoesTabParentHaveIMEFocus(this)) {
    return IPC_OK();
  }
  mContentCache.AssignContent(aContentCache, widget, &aIMENotification);
  mContentCache.MaybeNotifyIME(widget, aIMENotification);
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvNotifyIMECompositionUpdate(
    const ContentCache& aContentCache,
    const IMENotification& aIMENotification) {
  nsCOMPtr<nsIWidget> widget = GetDocWidget();
  if (!widget || !IMEStateManager::DoesTabParentHaveIMEFocus(this)) {
    return IPC_OK();
  }
  mContentCache.AssignContent(aContentCache, widget, &aIMENotification);
  mContentCache.MaybeNotifyIME(widget, aIMENotification);
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvNotifyIMESelection(
    const ContentCache& aContentCache,
    const IMENotification& aIMENotification) {
  nsCOMPtr<nsIWidget> widget = GetDocWidget();
  if (!widget || !IMEStateManager::DoesTabParentHaveIMEFocus(this)) {
    return IPC_OK();
  }
  mContentCache.AssignContent(aContentCache, widget, &aIMENotification);
  mContentCache.MaybeNotifyIME(widget, aIMENotification);
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvUpdateContentCache(
    const ContentCache& aContentCache) {
  nsCOMPtr<nsIWidget> widget = GetDocWidget();
  if (!widget || !IMEStateManager::DoesTabParentHaveIMEFocus(this)) {
    return IPC_OK();
  }

  mContentCache.AssignContent(aContentCache, widget);
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvNotifyIMEMouseButtonEvent(
    const IMENotification& aIMENotification, bool* aConsumedByIME) {
  nsCOMPtr<nsIWidget> widget = GetDocWidget();
  if (!widget || !IMEStateManager::DoesTabParentHaveIMEFocus(this)) {
    *aConsumedByIME = false;
    return IPC_OK();
  }
  nsresult rv = IMEStateManager::NotifyIME(aIMENotification, widget, this);
  *aConsumedByIME = rv == NS_SUCCESS_EVENT_CONSUMED;
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvNotifyIMEPositionChange(
    const ContentCache& aContentCache,
    const IMENotification& aIMENotification) {
  nsCOMPtr<nsIWidget> widget = GetDocWidget();
  if (!widget || !IMEStateManager::DoesTabParentHaveIMEFocus(this)) {
    return IPC_OK();
  }
  mContentCache.AssignContent(aContentCache, widget, &aIMENotification);
  mContentCache.MaybeNotifyIME(widget, aIMENotification);
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvOnEventNeedingAckHandled(
    const EventMessage& aMessage) {
  // This is called when the child process receives WidgetCompositionEvent or
  // WidgetSelectionEvent.
  // FYI: Don't check if widget is nullptr here because it's more important to
  //      notify mContentCahce of this than handling something in it.
  nsCOMPtr<nsIWidget> widget = GetDocWidget();

  // While calling OnEventNeedingAckHandled(), TabParent *might* be destroyed
  // since it may send notifications to IME.
  RefPtr<TabParent> kungFuDeathGrip(this);
  mContentCache.OnEventNeedingAckHandled(widget, aMessage);
  return IPC_OK();
}

void TabParent::HandledWindowedPluginKeyEvent(
    const NativeEventData& aKeyEventData, bool aIsConsumed) {
  DebugOnly<bool> ok =
      SendHandledWindowedPluginKeyEvent(aKeyEventData, aIsConsumed);
  NS_WARNING_ASSERTION(ok, "SendHandledWindowedPluginKeyEvent failed");
}

mozilla::ipc::IPCResult TabParent::RecvOnWindowedPluginKeyEvent(
    const NativeEventData& aKeyEventData) {
  nsCOMPtr<nsIWidget> widget = GetWidget();
  if (NS_WARN_IF(!widget)) {
    // Notifies the plugin process of the key event being not consumed by us.
    HandledWindowedPluginKeyEvent(aKeyEventData, false);
    return IPC_OK();
  }
  nsresult rv = widget->OnWindowedPluginKeyEvent(aKeyEventData, this);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    // Notifies the plugin process of the key event being not consumed by us.
    HandledWindowedPluginKeyEvent(aKeyEventData, false);
    return IPC_OK();
  }

  // If the key event is posted to another process, we need to wait a call
  // of HandledWindowedPluginKeyEvent().  So, nothing to do here in this case.
  if (rv == NS_SUCCESS_EVENT_HANDLED_ASYNCHRONOUSLY) {
    return IPC_OK();
  }

  // Otherwise, the key event is handled synchronously.  Let's notify the
  // plugin process of the key event's result.
  bool consumed = (rv == NS_SUCCESS_EVENT_CONSUMED);
  HandledWindowedPluginKeyEvent(aKeyEventData, consumed);

  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvRequestFocus(const bool& aCanRaise) {
  nsCOMPtr<nsIFocusManager> fm = nsFocusManager::GetFocusManager();
  if (!fm) {
    return IPC_OK();
  }

  if (!mFrameElement || !mFrameElement->OwnerDoc()) {
    return IPC_OK();
  }

  uint32_t flags = nsIFocusManager::FLAG_NOSCROLL;
  if (aCanRaise) flags |= nsIFocusManager::FLAG_RAISE;

  RefPtr<Element> element = mFrameElement;
  fm->SetFocus(element, flags);
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvEnableDisableCommands(
    const nsString& aAction, nsTArray<nsCString>&& aEnabledCommands,
    nsTArray<nsCString>&& aDisabledCommands) {
  nsCOMPtr<nsIBrowser> browser =
      mFrameElement ? mFrameElement->AsBrowser() : nullptr;
  bool isRemoteBrowser = false;
  if (browser) {
    browser->GetIsRemoteBrowser(&isRemoteBrowser);
  }
  if (isRemoteBrowser) {
    UniquePtr<const char*[]> enabledCommands, disabledCommands;

    if (aEnabledCommands.Length()) {
      enabledCommands = MakeUnique<const char*[]>(aEnabledCommands.Length());
      for (uint32_t c = 0; c < aEnabledCommands.Length(); c++) {
        enabledCommands[c] = aEnabledCommands[c].get();
      }
    }

    if (aDisabledCommands.Length()) {
      disabledCommands = MakeUnique<const char*[]>(aDisabledCommands.Length());
      for (uint32_t c = 0; c < aDisabledCommands.Length(); c++) {
        disabledCommands[c] = aDisabledCommands[c].get();
      }
    }

    browser->EnableDisableCommandsRemoteOnly(
        aAction, aEnabledCommands.Length(), enabledCommands.get(),
        aDisabledCommands.Length(), disabledCommands.get());
  }

  return IPC_OK();
}

NS_IMETHODIMP
TabParent::GetChildProcessOffset(int32_t* aOutCssX, int32_t* aOutCssY) {
  NS_ENSURE_ARG(aOutCssX);
  NS_ENSURE_ARG(aOutCssY);
  CSSPoint offset =
      LayoutDevicePoint(GetChildProcessOffset()) * GetLayoutDeviceToCSSScale();
  *aOutCssX = offset.x;
  *aOutCssY = offset.y;
  return NS_OK;
}

LayoutDeviceIntPoint TabParent::GetChildProcessOffset() {
  // The "toplevel widget" in child processes is always at position
  // 0,0.  Map the event coordinates to match that.

  LayoutDeviceIntPoint offset(0, 0);
  RefPtr<nsFrameLoader> frameLoader = GetFrameLoader();
  if (!frameLoader) {
    return offset;
  }
  nsIFrame* targetFrame = frameLoader->GetPrimaryFrameOfOwningContent();
  if (!targetFrame) {
    return offset;
  }

  nsCOMPtr<nsIWidget> widget = GetWidget();
  if (!widget) {
    return offset;
  }

  nsPresContext* presContext = targetFrame->PresContext();
  nsIFrame* rootFrame = presContext->PresShell()->GetRootFrame();
  nsView* rootView = rootFrame ? rootFrame->GetView() : nullptr;
  if (!rootView) {
    return offset;
  }

  // Note that we don't want to take into account transforms here:
#if 0
  nsPoint pt(0, 0);
  nsLayoutUtils::TransformPoint(targetFrame, rootFrame, pt);
#endif
  // In practice, when transforms are applied to this frameLoader, we currently
  // get the wrong results whether we take transforms into account here or not.
  // But applying transforms here gives us the wrong results in all
  // circumstances when transforms are applied, unless they're purely
  // translational. It also gives us the wrong results whenever CSS transitions
  // are used to apply transforms, since the offeets aren't updated as the
  // transition is animated.
  //
  // What we actually need to do is apply the transforms to the coordinates of
  // any events we send to the child, and reverse them for any screen
  // coordinates that we retrieve from the child.

  nsPoint pt = targetFrame->GetOffsetTo(rootFrame);
  return -nsLayoutUtils::TranslateViewToWidget(presContext, rootView, pt,
                                               widget);
}

LayoutDeviceIntPoint TabParent::GetClientOffset() {
  nsCOMPtr<nsIWidget> widget = GetWidget();
  nsCOMPtr<nsIWidget> docWidget = GetDocWidget();

  if (widget == docWidget) {
    return widget->GetClientOffset();
  }

  return (docWidget->GetClientOffset() +
          nsLayoutUtils::WidgetToWidgetOffset(widget, docWidget));
}

mozilla::ipc::IPCResult TabParent::RecvReplyKeyEvent(
    const WidgetKeyboardEvent& aEvent) {
  NS_ENSURE_TRUE(mFrameElement, IPC_OK());

  WidgetKeyboardEvent localEvent(aEvent);
  localEvent.MarkAsHandledInRemoteProcess();

  // Here we convert the WidgetEvent that we received to an Event
  // to be able to dispatch it to the <browser> element as the target element.
  Document* doc = mFrameElement->OwnerDoc();
  nsPresContext* presContext = doc->GetPresContext();
  NS_ENSURE_TRUE(presContext, IPC_OK());

  AutoHandlingUserInputStatePusher userInpStatePusher(localEvent.IsTrusted(),
                                                      &localEvent, doc);

  nsEventStatus status = nsEventStatus_eIgnore;

  // Handle access key in this process before dispatching reply event because
  // ESM handles it before dispatching the event to the DOM tree.
  if (localEvent.mMessage == eKeyPress &&
      (localEvent.ModifiersMatchWithAccessKey(AccessKeyType::eChrome) ||
       localEvent.ModifiersMatchWithAccessKey(AccessKeyType::eContent))) {
    RefPtr<EventStateManager> esm = presContext->EventStateManager();
    AutoTArray<uint32_t, 10> accessCharCodes;
    localEvent.GetAccessKeyCandidates(accessCharCodes);
    if (esm->HandleAccessKey(&localEvent, presContext, accessCharCodes)) {
      status = nsEventStatus_eConsumeNoDefault;
    }
  }

  EventDispatcher::Dispatch(mFrameElement, presContext, &localEvent, nullptr,
                            &status);

  if (!localEvent.DefaultPrevented() &&
      !localEvent.mFlags.mIsSynthesizedForTests) {
    nsCOMPtr<nsIWidget> widget = GetWidget();
    if (widget) {
      widget->PostHandleKeyEvent(&localEvent);
      localEvent.StopPropagation();
    }
  }

  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvAccessKeyNotHandled(
    const WidgetKeyboardEvent& aEvent) {
  NS_ENSURE_TRUE(mFrameElement, IPC_OK());

  // This is called only when this process had focus and HandleAccessKey
  // message was posted to all remote process and each remote process didn't
  // execute any content access keys.
  // XXX If there were two or more remote processes, this may be called
  //     twice or more for a keyboard event, that must be a bug.  But how to
  //     detect if received event has already been handled?

  MOZ_ASSERT(aEvent.mMessage == eKeyPress);
  WidgetKeyboardEvent localEvent(aEvent);
  localEvent.MarkAsHandledInRemoteProcess();
  localEvent.mMessage = eAccessKeyNotFound;

  // Here we convert the WidgetEvent that we received to an Event
  // to be able to dispatch it to the <browser> element as the target element.
  Document* doc = mFrameElement->OwnerDoc();
  nsIPresShell* presShell = doc->GetShell();
  NS_ENSURE_TRUE(presShell, IPC_OK());

  if (presShell->CanDispatchEvent()) {
    nsPresContext* presContext = presShell->GetPresContext();
    NS_ENSURE_TRUE(presContext, IPC_OK());

    EventDispatcher::Dispatch(mFrameElement, presContext, &localEvent);
  }

  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvSetHasBeforeUnload(
    const bool& aHasBeforeUnload) {
  mHasBeforeUnload = aHasBeforeUnload;
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvRegisterProtocolHandler(
    const nsString& aScheme, nsIURI* aHandlerURI, const nsString& aTitle,
    nsIURI* aDocURI) {
  nsCOMPtr<nsIWebProtocolHandlerRegistrar> registrar =
      do_GetService(NS_WEBPROTOCOLHANDLERREGISTRAR_CONTRACTID);
  if (registrar) {
    registrar->RegisterProtocolHandler(aScheme, aHandlerURI, aTitle, aDocURI,
                                       mFrameElement);
  }

  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvOnContentBlockingEvent(
    const OptionalWebProgressData& aWebProgressData,
    const RequestData& aRequestData, const uint32_t& aEvent) {
  nsCOMPtr<nsIBrowser> browser =
      mFrameElement ? mFrameElement->AsBrowser() : nullptr;
  if (browser) {
    MOZ_ASSERT(aWebProgressData.type() != OptionalWebProgressData::T__None);

    if (aWebProgressData.type() == OptionalWebProgressData::Tvoid_t) {
      Unused << browser->CallWebProgressContentBlockingEventListeners(
          false, false, false, 0, 0, aRequestData.requestURI(),
          aRequestData.originalRequestURI(), aRequestData.matchedList(),
          aEvent);
    } else {
      if (aWebProgressData.get_WebProgressData().isTopLevel()) {
        Unused << browser->UpdateSecurityUIForContentBlockingEvent(aEvent);
      }
      Unused << browser->CallWebProgressContentBlockingEventListeners(
          true, aWebProgressData.get_WebProgressData().isTopLevel(),
          aWebProgressData.get_WebProgressData().isLoadingDocument(),
          aWebProgressData.get_WebProgressData().loadType(),
          aWebProgressData.get_WebProgressData().DOMWindowID(),
          aRequestData.requestURI(), aRequestData.originalRequestURI(),
          aRequestData.matchedList(), aEvent);
    }
  }

  return IPC_OK();
}

bool TabParent::HandleQueryContentEvent(WidgetQueryContentEvent& aEvent) {
  nsCOMPtr<nsIWidget> widget = GetWidget();
  if (!widget) {
    return true;
  }
  if (NS_WARN_IF(!mContentCache.HandleQueryContentEvent(aEvent, widget)) ||
      NS_WARN_IF(!aEvent.mSucceeded)) {
    return true;
  }
  switch (aEvent.mMessage) {
    case eQueryTextRect:
    case eQueryCaretRect:
    case eQueryEditorRect: {
      nsCOMPtr<nsIWidget> widget = GetWidget();
      nsCOMPtr<nsIWidget> docWidget = GetDocWidget();
      if (widget != docWidget) {
        aEvent.mReply.mRect +=
            nsLayoutUtils::WidgetToWidgetOffset(widget, docWidget);
      }
      aEvent.mReply.mRect -= GetChildProcessOffset();
      break;
    }
    default:
      break;
  }
  return true;
}

bool TabParent::SendCompositionEvent(WidgetCompositionEvent& aEvent) {
  if (mIsDestroyed) {
    return false;
  }

  if (!mContentCache.OnCompositionEvent(aEvent)) {
    return true;
  }

  bool ret = Manager()->AsContentParent()->IsInputPriorityEventEnabled()
                 ? PBrowserParent::SendCompositionEvent(aEvent)
                 : PBrowserParent::SendNormalPriorityCompositionEvent(aEvent);
  if (NS_WARN_IF(!ret)) {
    return false;
  }
  MOZ_ASSERT(aEvent.HasBeenPostedToRemoteProcess());
  return true;
}

bool TabParent::SendSelectionEvent(WidgetSelectionEvent& aEvent) {
  if (mIsDestroyed) {
    return false;
  }
  nsCOMPtr<nsIWidget> widget = GetWidget();
  if (!widget) {
    return true;
  }
  mContentCache.OnSelectionEvent(aEvent);
  bool ret = Manager()->AsContentParent()->IsInputPriorityEventEnabled()
                 ? PBrowserParent::SendSelectionEvent(aEvent)
                 : PBrowserParent::SendNormalPrioritySelectionEvent(aEvent);
  if (NS_WARN_IF(!ret)) {
    return false;
  }
  MOZ_ASSERT(aEvent.HasBeenPostedToRemoteProcess());
  aEvent.mSucceeded = true;
  return true;
}

bool TabParent::SendPasteTransferable(
    const IPCDataTransfer& aDataTransfer, const bool& aIsPrivateData,
    const IPC::Principal& aRequestingPrincipal,
    const uint32_t& aContentPolicyType) {
  return PBrowserParent::SendPasteTransferable(
      aDataTransfer, aIsPrivateData, aRequestingPrincipal, aContentPolicyType);
}

/*static*/ TabParent* TabParent::GetFrom(nsFrameLoader* aFrameLoader) {
  if (!aFrameLoader) {
    return nullptr;
  }
  PBrowserParent* remoteBrowser = aFrameLoader->GetRemoteBrowser();
  return static_cast<TabParent*>(remoteBrowser);
}

/*static*/ TabParent* TabParent::GetFrom(nsITabParent* aTabParent) {
  return static_cast<TabParent*>(aTabParent);
}

/*static*/ TabParent* TabParent::GetFrom(PBrowserParent* aTabParent) {
  return static_cast<TabParent*>(aTabParent);
}

/*static*/ TabParent* TabParent::GetFrom(nsIContent* aContent) {
  nsCOMPtr<nsIFrameLoaderOwner> loaderOwner = do_QueryInterface(aContent);
  if (!loaderOwner) {
    return nullptr;
  }
  RefPtr<nsFrameLoader> frameLoader = loaderOwner->GetFrameLoader();
  return GetFrom(frameLoader);
}

/*static*/ TabId TabParent::GetTabIdFrom(nsIDocShell* docShell) {
  nsCOMPtr<nsITabChild> tabChild(TabChild::GetFrom(docShell));
  if (tabChild) {
    return static_cast<TabChild*>(tabChild.get())->GetTabId();
  }
  return TabId(0);
}

RenderFrame* TabParent::GetRenderFrame() {
  if (!mRenderFrame.IsInitialized()) {
    return nullptr;
  }
  return &mRenderFrame;
}

mozilla::ipc::IPCResult TabParent::RecvRequestIMEToCommitComposition(
    const bool& aCancel, bool* aIsCommitted, nsString* aCommittedString) {
  nsCOMPtr<nsIWidget> widget = GetWidget();
  if (!widget) {
    *aIsCommitted = false;
    return IPC_OK();
  }

  *aIsCommitted = mContentCache.RequestIMEToCommitComposition(
      widget, aCancel, *aCommittedString);
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvStartPluginIME(
    const WidgetKeyboardEvent& aKeyboardEvent, const int32_t& aPanelX,
    const int32_t& aPanelY, nsString* aCommitted) {
  nsCOMPtr<nsIWidget> widget = GetWidget();
  if (!widget) {
    return IPC_OK();
  }
  Unused << widget->StartPluginIME(aKeyboardEvent, (int32_t&)aPanelX,
                                   (int32_t&)aPanelY, *aCommitted);
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvSetPluginFocused(const bool& aFocused) {
  nsCOMPtr<nsIWidget> widget = GetWidget();
  if (!widget) {
    return IPC_OK();
  }
  widget->SetPluginFocused((bool&)aFocused);
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvSetCandidateWindowForPlugin(
    const CandidateWindowPosition& aPosition) {
  nsCOMPtr<nsIWidget> widget = GetWidget();
  if (!widget) {
    return IPC_OK();
  }

  widget->SetCandidateWindowForPlugin(aPosition);
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvEnableIMEForPlugin(const bool& aEnable) {
  nsCOMPtr<nsIWidget> widget = GetWidget();
  if (!widget) {
    return IPC_OK();
  }
  widget->EnableIMEForPlugin(aEnable);
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvDefaultProcOfPluginEvent(
    const WidgetPluginEvent& aEvent) {
  nsCOMPtr<nsIWidget> widget = GetWidget();
  if (!widget) {
    return IPC_OK();
  }

  widget->DefaultProcOfPluginEvent(aEvent);
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvGetInputContext(
    widget::IMEState* aState) {
  nsCOMPtr<nsIWidget> widget = GetWidget();
  if (!widget) {
    *aState = widget::IMEState(IMEState::DISABLED,
                               IMEState::OPEN_STATE_NOT_SUPPORTED);
    return IPC_OK();
  }

  *aState = widget->GetInputContext().mIMEState;
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvSetInputContext(
    const InputContext& aContext, const InputContextAction& aAction) {
  IMEStateManager::SetInputContextForChildProcess(this, aContext, aAction);
  return IPC_OK();
}

already_AddRefed<nsIWidget> TabParent::GetTopLevelWidget() {
  nsCOMPtr<nsIContent> content = mFrameElement;
  if (content) {
    nsIPresShell* shell = content->OwnerDoc()->GetShell();
    if (shell) {
      nsViewManager* vm = shell->GetViewManager();
      nsCOMPtr<nsIWidget> widget;
      vm->GetRootWidget(getter_AddRefs(widget));
      return widget.forget();
    }
  }
  return nullptr;
}

mozilla::ipc::IPCResult TabParent::RecvSetNativeChildOfShareableWindow(
    const uintptr_t& aChildWindow) {
#if defined(XP_WIN)
  nsCOMPtr<nsIWidget> widget = GetTopLevelWidget();
  if (widget) {
    // Note that this call will probably cause a sync native message to the
    // process that owns the child window.
    widget->SetNativeData(NS_NATIVE_CHILD_OF_SHAREABLE_WINDOW, aChildWindow);
  }
  return IPC_OK();
#else
  MOZ_ASSERT_UNREACHABLE(
      "TabParent::RecvSetNativeChildOfShareableWindow not implemented!");
  return IPC_FAIL_NO_REASON(this);
#endif
}

mozilla::ipc::IPCResult TabParent::RecvDispatchFocusToTopLevelWindow() {
  nsCOMPtr<nsIWidget> widget = GetTopLevelWidget();
  if (widget) {
    widget->SetFocus(false);
  }
  return IPC_OK();
}

bool TabParent::ReceiveMessage(const nsString& aMessage, bool aSync,
                               StructuredCloneData* aData, CpowHolder* aCpows,
                               nsIPrincipal* aPrincipal,
                               nsTArray<StructuredCloneData>* aRetVal) {
  RefPtr<nsFrameLoader> frameLoader = GetFrameLoader(true);
  if (frameLoader && frameLoader->GetFrameMessageManager()) {
    RefPtr<nsFrameMessageManager> manager =
        frameLoader->GetFrameMessageManager();

    manager->ReceiveMessage(mFrameElement, frameLoader, aMessage, aSync, aData,
                            aCpows, aPrincipal, aRetVal, IgnoreErrors());
  }
  return true;
}

// nsIAuthPromptProvider

// This method is largely copied from nsDocShell::GetAuthPrompt
NS_IMETHODIMP
TabParent::GetAuthPrompt(uint32_t aPromptReason, const nsIID& iid,
                         void** aResult) {
  // we're either allowing auth, or it's a proxy request
  nsresult rv;
  nsCOMPtr<nsIPromptFactory> wwatch =
      do_GetService(NS_WINDOWWATCHER_CONTRACTID, &rv);
  NS_ENSURE_SUCCESS(rv, rv);

  nsCOMPtr<nsPIDOMWindowOuter> window;
  nsCOMPtr<nsIContent> frame = mFrameElement;
  if (frame) window = frame->OwnerDoc()->GetWindow();

  // Get an auth prompter for our window so that the parenting
  // of the dialogs works as it should when using tabs.
  nsCOMPtr<nsISupports> prompt;
  rv = wwatch->GetPrompt(window, iid, getter_AddRefs(prompt));
  NS_ENSURE_SUCCESS(rv, rv);

  nsCOMPtr<nsILoginManagerPrompter> prompter = do_QueryInterface(prompt);
  if (prompter) {
    prompter->SetBrowser(mFrameElement);
  }

  *aResult = prompt.forget().take();
  return NS_OK;
}

PColorPickerParent* TabParent::AllocPColorPickerParent(
    const nsString& aTitle, const nsString& aInitialColor) {
  return new ColorPickerParent(aTitle, aInitialColor);
}

bool TabParent::DeallocPColorPickerParent(PColorPickerParent* actor) {
  delete actor;
  return true;
}

already_AddRefed<nsFrameLoader> TabParent::GetFrameLoader(
    bool aUseCachedFrameLoaderAfterDestroy) const {
  if (mIsDestroyed && !aUseCachedFrameLoaderAfterDestroy) {
    return nullptr;
  }

  if (mFrameLoader) {
    RefPtr<nsFrameLoader> fl = mFrameLoader;
    return fl.forget();
  }
  nsCOMPtr<nsIFrameLoaderOwner> frameLoaderOwner =
      do_QueryInterface(mFrameElement);
  return frameLoaderOwner ? frameLoaderOwner->GetFrameLoader() : nullptr;
}

void TabParent::TryCacheDPIAndScale() {
  if (mDPI > 0) {
    return;
  }

  nsCOMPtr<nsIWidget> widget = GetWidget();

  if (widget) {
    mDPI = widget->GetDPI();
    mRounding = widget->RoundsWidgetCoordinatesTo();
    mDefaultScale = widget->GetDefaultScale();
  }
}

already_AddRefed<nsIWidget> TabParent::GetWidget() const {
  if (!mFrameElement) {
    return nullptr;
  }
  nsCOMPtr<nsIWidget> widget = nsContentUtils::WidgetForContent(mFrameElement);
  if (!widget) {
    widget = nsContentUtils::WidgetForDocument(mFrameElement->OwnerDoc());
  }
  return widget.forget();
}

already_AddRefed<nsIWidget> TabParent::GetDocWidget() const {
  if (!mFrameElement) {
    return nullptr;
  }
  return do_AddRef(
      nsContentUtils::WidgetForDocument(mFrameElement->OwnerDoc()));
}

void TabParent::ApzAwareEventRoutingToChild(ScrollableLayerGuid* aOutTargetGuid,
                                            uint64_t* aOutInputBlockId,
                                            nsEventStatus* aOutApzResponse) {
  // Let the widget know that the event will be sent to the child process,
  // which will (hopefully) send a confirmation notice back to APZ.
  // Do this even if APZ is off since we need it for swipe gesture support on
  // OS X without APZ.
  InputAPZContext::SetRoutedToChildProcess();

  if (AsyncPanZoomEnabled()) {
    if (aOutTargetGuid) {
      *aOutTargetGuid = InputAPZContext::GetTargetLayerGuid();

      // There may be cases where the APZ hit-testing code came to a different
      // conclusion than the main-thread hit-testing code as to where the event
      // is destined. In such cases the layersId of the APZ result may not match
      // the layersId of this renderframe. In such cases the main-thread hit-
      // testing code "wins" so we need to update the guid to reflect this.
      if (mRenderFrame.IsInitialized()) {
        if (aOutTargetGuid->mLayersId != mRenderFrame.GetLayersId()) {
          *aOutTargetGuid =
              ScrollableLayerGuid(mRenderFrame.GetLayersId(), 0,
                                  ScrollableLayerGuid::NULL_SCROLL_ID);
        }
      }
    }
    if (aOutInputBlockId) {
      *aOutInputBlockId = InputAPZContext::GetInputBlockId();
    }
    if (aOutApzResponse) {
      *aOutApzResponse = InputAPZContext::GetApzResponse();
    }
  } else {
    if (aOutInputBlockId) {
      *aOutInputBlockId = 0;
    }
    if (aOutApzResponse) {
      *aOutApzResponse = nsEventStatus_eIgnore;
    }
  }
}

mozilla::ipc::IPCResult TabParent::RecvBrowserFrameOpenWindow(
    PBrowserParent* aOpener, const nsString& aURL, const nsString& aName,
    const nsString& aFeatures, BrowserFrameOpenWindowResolver&& aResolve) {
  CreatedWindowInfo cwi;
  cwi.rv() = NS_OK;
  cwi.maxTouchPoints() = 0;

  BrowserElementParent::OpenWindowResult opened =
      BrowserElementParent::OpenWindowOOP(TabParent::GetFrom(aOpener), this,
                                          aURL, aName, aFeatures);
  cwi.windowOpened() = (opened == BrowserElementParent::OPEN_WINDOW_ADDED);
  nsCOMPtr<nsIWidget> widget = GetWidget();
  if (widget) {
    cwi.maxTouchPoints() = widget->GetMaxTouchPoints();
    cwi.dimensions() = GetDimensionInfo();
  }

  // Resolve the request with the information we collected.
  aResolve(cwi);

  if (!cwi.windowOpened()) {
    Destroy();
  }
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvRespondStartSwipeEvent(
    const uint64_t& aInputBlockId, const bool& aStartSwipe) {
  if (nsCOMPtr<nsIWidget> widget = GetWidget()) {
    widget->ReportSwipeStarted(aInputBlockId, aStartSwipe);
  }
  return IPC_OK();
}

already_AddRefed<nsILoadContext> TabParent::GetLoadContext() {
  nsCOMPtr<nsILoadContext> loadContext;
  if (mLoadContext) {
    loadContext = mLoadContext;
  } else {
    bool isPrivate = mChromeFlags & nsIWebBrowserChrome::CHROME_PRIVATE_WINDOW;
    SetPrivateBrowsingAttributes(isPrivate);
    bool useTrackingProtection = false;
    nsCOMPtr<nsIDocShell> docShell = mFrameElement->OwnerDoc()->GetDocShell();
    if (docShell) {
      docShell->GetUseTrackingProtection(&useTrackingProtection);
    }
    loadContext = new LoadContext(
        GetOwnerElement(), true /* aIsContent */, isPrivate,
        mChromeFlags & nsIWebBrowserChrome::CHROME_REMOTE_WINDOW,
        useTrackingProtection, OriginAttributesRef());
    mLoadContext = loadContext;
  }
  return loadContext.forget();
}

// defined in nsITabParent
NS_IMETHODIMP
TabParent::SetDocShellIsActive(bool isActive) {
  mDocShellIsActive = isActive;
  SetRenderLayers(isActive);
  Unused << SendSetDocShellIsActive(isActive);

  // update active accessible documents on windows
#if defined(XP_WIN) && defined(ACCESSIBILITY)
  if (a11y::Compatibility::IsDolphin()) {
    if (a11y::DocAccessibleParent* tabDoc = GetTopLevelDocAccessible()) {
      HWND window = tabDoc->GetEmulatedWindowHandle();
      MOZ_ASSERT(window);
      if (window) {
        if (isActive) {
          a11y::nsWinUtils::ShowNativeWindow(window);
        } else {
          a11y::nsWinUtils::HideNativeWindow(window);
        }
      }
    }
  }
#endif

  // Keep track of how many active recording/replaying tabs there are.
  if (Manager()->AsContentParent()->IsRecordingOrReplaying()) {
    SetIsActiveRecordReplayTab(isActive);
  }

  return NS_OK;
}

NS_IMETHODIMP
TabParent::GetDocShellIsActive(bool* aIsActive) {
  *aIsActive = mDocShellIsActive;
  return NS_OK;
}

NS_IMETHODIMP
TabParent::SetRenderLayers(bool aEnabled) {
  if (mActiveInPriorityManager != aEnabled) {
    mActiveInPriorityManager = aEnabled;
    // Let's inform the priority manager. This operation can end up with the
    // changing of the process priority.
    ProcessPriorityManager::TabActivityChanged(this, aEnabled);
  }

  if (aEnabled == mRenderLayers) {
    if (aEnabled && mHasLayers && mPreserveLayers) {
      // RenderLayers might be called when we've been preserving layers,
      // and already had layers uploaded. In that case, the MozLayerTreeReady
      // event will not naturally arrive, which can confuse the front-end
      // layer. So we fire the event here.
      RefPtr<TabParent> self = this;
      LayersObserverEpoch epoch = mLayerTreeEpoch;
      NS_DispatchToMainThread(NS_NewRunnableFunction(
          "dom::TabParent::RenderLayers", [self, epoch]() {
            MOZ_ASSERT(NS_IsMainThread());
            self->LayerTreeUpdate(epoch, true);
          }));
    }

    return NS_OK;
  }

  // Preserve layers means that attempts to stop rendering layers
  // will be ignored.
  if (!aEnabled && mPreserveLayers) {
    return NS_OK;
  }

  mRenderLayers = aEnabled;

  SetRenderLayersInternal(aEnabled, false /* aForceRepaint */);
  return NS_OK;
}

NS_IMETHODIMP
TabParent::GetRenderLayers(bool* aResult) {
  *aResult = mRenderLayers;
  return NS_OK;
}

NS_IMETHODIMP
TabParent::GetHasLayers(bool* aResult) {
  *aResult = mHasLayers;
  return NS_OK;
}

NS_IMETHODIMP
TabParent::Deprioritize() {
  if (mActiveInPriorityManager) {
    ProcessPriorityManager::TabActivityChanged(this, false);
    mActiveInPriorityManager = false;
  }
  return NS_OK;
}

NS_IMETHODIMP
TabParent::ForceRepaint() {
  if (!mActiveInPriorityManager) {
    // If a tab is left and then returned to very rapidly, it can be
    // deprioritized without losing its loaded status. In this case we won't
    // go through SetRenderLayers.
    mActiveInPriorityManager = true;
    ProcessPriorityManager::TabActivityChanged(this, true);
  }

  SetRenderLayersInternal(true /* aEnabled */, true /* aForceRepaint */);
  return NS_OK;
}

void TabParent::SetRenderLayersInternal(bool aEnabled, bool aForceRepaint) {
  // Increment the epoch so that layer tree updates from previous
  // RenderLayers requests are ignored.
  mLayerTreeEpoch = mLayerTreeEpoch.Next();

  Unused << SendRenderLayers(aEnabled, aForceRepaint, mLayerTreeEpoch);

  // Ask the child to repaint using the PHangMonitor channel/thread (which may
  // be less congested).
  if (aEnabled) {
    ContentParent* cp = Manager()->AsContentParent();
    cp->PaintTabWhileInterruptingJS(this, aForceRepaint, mLayerTreeEpoch);
  }
}

NS_IMETHODIMP
TabParent::PreserveLayers(bool aPreserveLayers) {
  mPreserveLayers = aPreserveLayers;
  return NS_OK;
}

NS_IMETHODIMP
TabParent::SaveRecording(const nsAString& aFilename, bool* aRetval) {
  nsCOMPtr<nsIFile> file;
  nsresult rv = NS_NewLocalFile(aFilename, false, getter_AddRefs(file));
  if (NS_FAILED(rv)) {
    return rv;
  }
  return Manager()->AsContentParent()->SaveRecording(file, aRetval);
}

NS_IMETHODIMP
TabParent::GetContentBlockingLog(Promise** aPromise) {
  NS_ENSURE_ARG_POINTER(aPromise);

  *aPromise = nullptr;
  if (!mFrameElement) {
    return NS_ERROR_FAILURE;
  }

  ErrorResult rv;
  RefPtr<Promise> jsPromise =
      Promise::Create(mFrameElement->OwnerDoc()->GetOwnerGlobal(), rv);
  if (rv.Failed()) {
    return NS_ERROR_FAILURE;
  }

  RefPtr<Promise> copy(jsPromise);
  copy.forget(aPromise);

  auto cblPromise = SendGetContentBlockingLog();
  cblPromise->Then(GetMainThreadSerialEventTarget(), __func__,
                   [jsPromise](Tuple<nsCString, bool>&& aResult) {
                     if (Get<1>(aResult)) {
                       NS_ConvertUTF8toUTF16 utf16(Get<0>(aResult));
                       jsPromise->MaybeResolve(std::move(utf16));
                     } else {
                       jsPromise->MaybeRejectWithUndefined();
                     }
                   },
                   [jsPromise](ResponseRejectReason&& aReason) {
                     jsPromise->MaybeRejectWithUndefined();
                   });

  return NS_OK;
}

void TabParent::SuppressDisplayport(bool aEnabled) {
  if (IsDestroyed()) {
    return;
  }

#ifdef DEBUG
  if (aEnabled) {
    mActiveSupressDisplayportCount++;
  } else {
    mActiveSupressDisplayportCount--;
  }
  MOZ_ASSERT(mActiveSupressDisplayportCount >= 0);
#endif

  Unused << SendSuppressDisplayport(aEnabled);
}

NS_IMETHODIMP
TabParent::GetTabId(uint64_t* aId) {
  *aId = GetTabId();
  return NS_OK;
}

NS_IMETHODIMP
TabParent::GetOsPid(int32_t* aId) {
  *aId = Manager()->Pid();
  return NS_OK;
}

NS_IMETHODIMP
TabParent::GetHasContentOpener(bool* aResult) {
  *aResult = mHasContentOpener;
  return NS_OK;
}

void TabParent::SetHasContentOpener(bool aHasContentOpener) {
  mHasContentOpener = aHasContentOpener;
}

NS_IMETHODIMP
TabParent::GetHasPresented(bool* aResult) {
  *aResult = mHasPresented;
  return NS_OK;
}

void TabParent::NavigateByKey(bool aForward, bool aForDocumentNavigation) {
  Unused << SendNavigateByKey(aForward, aForDocumentNavigation);
}

NS_IMETHODIMP
TabParent::TransmitPermissionsForPrincipal(nsIPrincipal* aPrincipal) {
  nsCOMPtr<nsIContentParent> manager = Manager();
  if (!manager->IsContentParent()) {
    return NS_ERROR_UNEXPECTED;
  }

  return manager->AsContentParent()->TransmitPermissionsForPrincipal(
      aPrincipal);
}

NS_IMETHODIMP
TabParent::GetHasBeforeUnload(bool* aResult) {
  *aResult = mHasBeforeUnload;
  return NS_OK;
}

void TabParent::LayerTreeUpdate(const LayersObserverEpoch& aEpoch,
                                bool aActive) {
  // Ignore updates from old epochs. They might tell us that layers are
  // available when we've already sent a message to clear them. We can't trust
  // the update in that case since layers could disappear anytime after that.
  if (aEpoch != mLayerTreeEpoch || mIsDestroyed) {
    return;
  }

  nsCOMPtr<mozilla::dom::EventTarget> target = mFrameElement;
  if (!target) {
    NS_WARNING("Could not locate target for layer tree message.");
    return;
  }

  mHasLayers = aActive;

  RefPtr<Event> event = NS_NewDOMEvent(mFrameElement, nullptr, nullptr);
  if (aActive) {
    mHasPresented = true;
    event->InitEvent(NS_LITERAL_STRING("MozLayerTreeReady"), true, false);
  } else {
    event->InitEvent(NS_LITERAL_STRING("MozLayerTreeCleared"), true, false);
  }
  event->SetTrusted(true);
  event->WidgetEventPtr()->mFlags.mOnlyChromeDispatch = true;
  mFrameElement->DispatchEvent(*event);
}

void TabParent::RequestRootPaint(gfx::CrossProcessPaint* aPaint, IntRect aRect,
                                 float aScale, nscolor aBackgroundColor) {
  auto promise = SendRequestRootPaint(aRect, aScale, aBackgroundColor);

  RefPtr<gfx::CrossProcessPaint> paint(aPaint);
  TabId tabId(GetTabId());
  promise->Then(GetMainThreadSerialEventTarget(), __func__,
                [paint, tabId](PaintFragment&& aFragment) {
                  paint->ReceiveFragment(tabId, std::move(aFragment));
                },
                [paint, tabId](ResponseRejectReason&& aReason) {
                  paint->LostFragment(tabId);
                });
}

void TabParent::RequestSubPaint(gfx::CrossProcessPaint* aPaint, float aScale,
                                nscolor aBackgroundColor) {
  auto promise = SendRequestSubPaint(aScale, aBackgroundColor);

  RefPtr<gfx::CrossProcessPaint> paint(aPaint);
  TabId tabId(GetTabId());
  promise->Then(GetMainThreadSerialEventTarget(), __func__,
                [paint, tabId](PaintFragment&& aFragment) {
                  paint->ReceiveFragment(tabId, std::move(aFragment));
                },
                [paint, tabId](ResponseRejectReason&& aReason) {
                  paint->LostFragment(tabId);
                });
}

mozilla::ipc::IPCResult TabParent::RecvPaintWhileInterruptingJSNoOp(
    const LayersObserverEpoch& aEpoch) {
  // We sent a PaintWhileInterruptingJS message when layers were already
  // visible. In this case, we should act as if an update occurred even though
  // we already have the layers.
  LayerTreeUpdate(aEpoch, true);
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvRemotePaintIsReady() {
  nsCOMPtr<mozilla::dom::EventTarget> target = mFrameElement;
  if (!target) {
    NS_WARNING("Could not locate target for MozAfterRemotePaint message.");
    return IPC_OK();
  }

  RefPtr<Event> event = NS_NewDOMEvent(mFrameElement, nullptr, nullptr);
  event->InitEvent(NS_LITERAL_STRING("MozAfterRemotePaint"), false, false);
  event->SetTrusted(true);
  event->WidgetEventPtr()->mFlags.mOnlyChromeDispatch = true;
  mFrameElement->DispatchEvent(*event);
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvNotifyCompositorTransaction() {
  RefPtr<nsFrameLoader> frameLoader = GetFrameLoader();

  if (!frameLoader) {
    return IPC_OK();
  }

  nsIFrame* docFrame = frameLoader->GetPrimaryFrameOfOwningContent();

  if (!docFrame) {
    // Bad, but nothing we can do about it (XXX/cjones: or is there?
    // maybe bug 589337?).  When the new frame is created, we'll
    // probably still be the current render frame and will get to draw
    // our content then.  Or, we're shutting down and this update goes
    // to /dev/null.
    return IPC_OK();
  }

  docFrame->InvalidateLayer(DisplayItemType::TYPE_REMOTE);
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvRemoteIsReadyToHandleInputEvents() {
  // When enabling input event prioritization, input events may preempt other
  // normal priority IPC messages. To prevent the input events preempt
  // PBrowserConstructor, we use an IPC 'RemoteIsReadyToHandleInputEvents' to
  // notify the parent that TabChild is created and ready to handle input
  // events.
  SetReadyToHandleInputEvents();
  return IPC_OK();
}

mozilla::plugins::PPluginWidgetParent* TabParent::AllocPPluginWidgetParent() {
#ifdef XP_WIN
  return new mozilla::plugins::PluginWidgetParent();
#else
  MOZ_ASSERT_UNREACHABLE("AllocPPluginWidgetParent only supports Windows");
  return nullptr;
#endif
}

bool TabParent::DeallocPPluginWidgetParent(
    mozilla::plugins::PPluginWidgetParent* aActor) {
  delete aActor;
  return true;
}

PPaymentRequestParent* TabParent::AllocPPaymentRequestParent() {
  RefPtr<PaymentRequestParent> actor = new PaymentRequestParent();
  return actor.forget().take();
}

bool TabParent::DeallocPPaymentRequestParent(PPaymentRequestParent* aActor) {
  RefPtr<PaymentRequestParent> actor =
      dont_AddRef(static_cast<PaymentRequestParent*>(aActor));
  return true;
}

nsresult TabParent::HandleEvent(Event* aEvent) {
  nsAutoString eventType;
  aEvent->GetType(eventType);

  if (eventType.EqualsLiteral("MozUpdateWindowPos") && !mIsDestroyed) {
    // This event is sent when the widget moved.  Therefore we only update
    // the position.
    return UpdatePosition();
  }
  return NS_OK;
}

class FakeChannel final : public nsIChannel,
                          public nsIAuthPromptCallback,
                          public nsIInterfaceRequestor,
                          public nsILoadContext {
 public:
  FakeChannel(const nsCString& aUri, uint64_t aCallbackId, Element* aElement)
      : mCallbackId(aCallbackId), mElement(aElement) {
    NS_NewURI(getter_AddRefs(mUri), aUri);
  }

  NS_DECL_ISUPPORTS
#define NO_IMPL \
  override { return NS_ERROR_NOT_IMPLEMENTED; }
  NS_IMETHOD GetName(nsACString&) NO_IMPL NS_IMETHOD
      IsPending(bool*) NO_IMPL NS_IMETHOD
      GetStatus(nsresult*) NO_IMPL NS_IMETHOD
      Cancel(nsresult) NO_IMPL NS_IMETHOD Suspend() NO_IMPL NS_IMETHOD
      Resume() NO_IMPL NS_IMETHOD
      GetLoadGroup(nsILoadGroup**) NO_IMPL NS_IMETHOD
      SetLoadGroup(nsILoadGroup*) NO_IMPL NS_IMETHOD
      SetLoadFlags(nsLoadFlags) NO_IMPL NS_IMETHOD
      GetLoadFlags(nsLoadFlags*) NO_IMPL NS_IMETHOD
      GetIsDocument(bool*) NO_IMPL NS_IMETHOD
      GetOriginalURI(nsIURI**) NO_IMPL NS_IMETHOD
      SetOriginalURI(nsIURI*) NO_IMPL NS_IMETHOD
      GetURI(nsIURI** aUri) override {
    nsCOMPtr<nsIURI> copy = mUri;
    copy.forget(aUri);
    return NS_OK;
  }
  NS_IMETHOD GetOwner(nsISupports**) NO_IMPL NS_IMETHOD
      SetOwner(nsISupports*) NO_IMPL NS_IMETHOD
      GetLoadInfo(nsILoadInfo** aLoadInfo) override {
    nsCOMPtr<nsILoadInfo> copy = mLoadInfo;
    copy.forget(aLoadInfo);
    return NS_OK;
  }
  NS_IMETHOD SetLoadInfo(nsILoadInfo* aLoadInfo) override {
    mLoadInfo = aLoadInfo;
    return NS_OK;
  }
  NS_IMETHOD GetNotificationCallbacks(
      nsIInterfaceRequestor** aRequestor) override {
    NS_ADDREF(*aRequestor = this);
    return NS_OK;
  }
  NS_IMETHOD SetNotificationCallbacks(nsIInterfaceRequestor*) NO_IMPL NS_IMETHOD
      GetSecurityInfo(nsISupports**) NO_IMPL NS_IMETHOD
      GetContentType(nsACString&) NO_IMPL NS_IMETHOD
      SetContentType(const nsACString&) NO_IMPL NS_IMETHOD
      GetContentCharset(nsACString&) NO_IMPL NS_IMETHOD
      SetContentCharset(const nsACString&) NO_IMPL NS_IMETHOD
      GetContentLength(int64_t*) NO_IMPL NS_IMETHOD
      SetContentLength(int64_t) NO_IMPL NS_IMETHOD
      Open(nsIInputStream**) NO_IMPL NS_IMETHOD
      Open2(nsIInputStream**) NO_IMPL NS_IMETHOD
      AsyncOpen(nsIStreamListener*, nsISupports*) NO_IMPL NS_IMETHOD
      AsyncOpen2(nsIStreamListener*) NO_IMPL NS_IMETHOD
      GetContentDisposition(uint32_t*) NO_IMPL NS_IMETHOD
      SetContentDisposition(uint32_t) NO_IMPL NS_IMETHOD
      GetContentDispositionFilename(nsAString&) NO_IMPL NS_IMETHOD
      SetContentDispositionFilename(const nsAString&) NO_IMPL NS_IMETHOD
      GetContentDispositionHeader(nsACString&) NO_IMPL NS_IMETHOD
      OnAuthAvailable(nsISupports* aContext,
                      nsIAuthInformation* aAuthInfo) override;
  NS_IMETHOD OnAuthCancelled(nsISupports* aContext, bool userCancel) override;
  NS_IMETHOD GetInterface(const nsIID& uuid, void** result) override {
    return QueryInterface(uuid, result);
  }
  NS_IMETHOD GetAssociatedWindow(mozIDOMWindowProxy**) NO_IMPL NS_IMETHOD
      GetTopWindow(mozIDOMWindowProxy**) NO_IMPL NS_IMETHOD
      GetTopFrameElement(Element** aElement) override {
    nsCOMPtr<Element> elem = mElement;
    elem.forget(aElement);
    return NS_OK;
  }
  NS_IMETHOD GetNestedFrameId(uint64_t*) NO_IMPL NS_IMETHOD
      GetIsContent(bool*) NO_IMPL NS_IMETHOD
      GetUsePrivateBrowsing(bool*) NO_IMPL NS_IMETHOD
      SetUsePrivateBrowsing(bool) NO_IMPL NS_IMETHOD
      SetPrivateBrowsing(bool) NO_IMPL NS_IMETHOD
      GetIsInIsolatedMozBrowserElement(bool*) NO_IMPL NS_IMETHOD
      GetScriptableOriginAttributes(JSContext*, JS::MutableHandleValue) NO_IMPL
      NS_IMETHOD_(void)
          GetOriginAttributes(mozilla::OriginAttributes& aAttrs) override {}
  NS_IMETHOD GetUseRemoteTabs(bool*) NO_IMPL NS_IMETHOD
      SetRemoteTabs(bool) NO_IMPL NS_IMETHOD
      GetUseTrackingProtection(bool*) NO_IMPL NS_IMETHOD
      SetUseTrackingProtection(bool) NO_IMPL
#undef NO_IMPL

      protected : ~FakeChannel() {
  }

  nsCOMPtr<nsIURI> mUri;
  uint64_t mCallbackId;
  nsCOMPtr<Element> mElement;
  nsCOMPtr<nsILoadInfo> mLoadInfo;
};

NS_IMPL_ISUPPORTS(FakeChannel, nsIChannel, nsIAuthPromptCallback, nsIRequest,
                  nsIInterfaceRequestor, nsILoadContext);

mozilla::ipc::IPCResult TabParent::RecvAsyncAuthPrompt(
    const nsCString& aUri, const nsString& aRealm,
    const uint64_t& aCallbackId) {
  nsCOMPtr<nsIAuthPrompt2> authPrompt;
  GetAuthPrompt(nsIAuthPromptProvider::PROMPT_NORMAL,
                NS_GET_IID(nsIAuthPrompt2), getter_AddRefs(authPrompt));
  RefPtr<FakeChannel> channel =
      new FakeChannel(aUri, aCallbackId, mFrameElement);
  uint32_t promptFlags = nsIAuthInformation::AUTH_HOST;

  RefPtr<nsAuthInformationHolder> holder =
      new nsAuthInformationHolder(promptFlags, aRealm, EmptyCString());

  uint32_t level = nsIAuthPrompt2::LEVEL_NONE;
  nsCOMPtr<nsICancelable> dummy;
  nsresult rv = authPrompt->AsyncPromptAuth(channel, channel, nullptr, level,
                                            holder, getter_AddRefs(dummy));

  if (NS_FAILED(rv)) {
    return IPC_FAIL_NO_REASON(this);
  }
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvInvokeDragSession(
    nsTArray<IPCDataTransfer>&& aTransfers, const uint32_t& aAction,
    const OptionalShmem& aVisualDnDData, const uint32_t& aStride,
    const gfx::SurfaceFormat& aFormat, const LayoutDeviceIntRect& aDragRect,
    const IPC::Principal& aPrincipal) {
  mInitialDataTransferItems.Clear();
  nsIPresShell* shell = mFrameElement->OwnerDoc()->GetShell();
  if (!shell) {
    if (Manager()->IsContentParent()) {
      Unused << Manager()->AsContentParent()->SendEndDragSession(
          true, true, LayoutDeviceIntPoint(), 0);
      // Continue sending input events with input priority when stopping the dnd
      // session.
      Manager()->AsContentParent()->SetInputPriorityEventEnabled(true);
    }
    return IPC_OK();
  }

  EventStateManager* esm = shell->GetPresContext()->EventStateManager();
  for (uint32_t i = 0; i < aTransfers.Length(); ++i) {
    mInitialDataTransferItems.AppendElement(std::move(aTransfers[i].items()));
  }
  if (Manager()->IsContentParent()) {
    nsCOMPtr<nsIDragService> dragService =
        do_GetService("@mozilla.org/widget/dragservice;1");
    if (dragService) {
      dragService->MaybeAddChildProcess(Manager()->AsContentParent());
    }
  }

  if (aVisualDnDData.type() == OptionalShmem::Tvoid_t ||
      !aVisualDnDData.get_Shmem().IsReadable() ||
      aVisualDnDData.get_Shmem().Size<char>() < aDragRect.height * aStride) {
    mDnDVisualization = nullptr;
  } else {
    mDnDVisualization = gfx::CreateDataSourceSurfaceFromData(
        gfx::IntSize(aDragRect.width, aDragRect.height), aFormat,
        aVisualDnDData.get_Shmem().get<uint8_t>(), aStride);
  }

  mDragValid = true;
  mDragRect = aDragRect;
  mDragPrincipal = aPrincipal;

  esm->BeginTrackingRemoteDragGesture(mFrameElement);

  if (aVisualDnDData.type() == OptionalShmem::TShmem) {
    Unused << DeallocShmem(aVisualDnDData);
  }

  return IPC_OK();
}

void TabParent::AddInitialDnDDataTo(DataTransfer* aDataTransfer,
                                    nsIPrincipal** aPrincipal) {
  NS_IF_ADDREF(*aPrincipal = mDragPrincipal);

  for (uint32_t i = 0; i < mInitialDataTransferItems.Length(); ++i) {
    nsTArray<IPCDataTransferItem>& itemArray = mInitialDataTransferItems[i];
    for (auto& item : itemArray) {
      RefPtr<nsVariantCC> variant = new nsVariantCC();
      // Special case kFilePromiseMime so that we get the right
      // nsIFlavorDataProvider for it.
      if (item.flavor().EqualsLiteral(kFilePromiseMime)) {
        RefPtr<nsISupports> flavorDataProvider =
            new nsContentAreaDragDropDataProvider();
        variant->SetAsISupports(flavorDataProvider);
      } else if (item.data().type() == IPCDataTransferData::TnsString) {
        variant->SetAsAString(item.data().get_nsString());
      } else if (item.data().type() == IPCDataTransferData::TIPCBlob) {
        RefPtr<BlobImpl> impl =
            IPCBlobUtils::Deserialize(item.data().get_IPCBlob());
        variant->SetAsISupports(impl);
      } else if (item.data().type() == IPCDataTransferData::TShmem) {
        if (nsContentUtils::IsFlavorImage(item.flavor())) {
          // An image! Get the imgIContainer for it and set it in the variant.
          nsCOMPtr<imgIContainer> imageContainer;
          nsresult rv = nsContentUtils::DataTransferItemToImage(
              item, getter_AddRefs(imageContainer));
          if (NS_FAILED(rv)) {
            continue;
          }
          variant->SetAsISupports(imageContainer);
        } else {
          Shmem data = item.data().get_Shmem();
          variant->SetAsACString(
              nsDependentCSubstring(data.get<char>(), data.Size<char>()));
        }

        mozilla::Unused << DeallocShmem(item.data().get_Shmem());
      }

      // We set aHidden to false, as we don't need to worry about hiding data
      // from content in the parent process where there is no content.
      // XXX: Nested Content Processes may change this
      aDataTransfer->SetDataWithPrincipalFromOtherProcess(
          NS_ConvertUTF8toUTF16(item.flavor()), variant, i, mDragPrincipal,
          /* aHidden = */ false);
    }
  }
  mInitialDataTransferItems.Clear();
  mDragPrincipal = nullptr;
}

bool TabParent::TakeDragVisualization(
    RefPtr<mozilla::gfx::SourceSurface>& aSurface,
    LayoutDeviceIntRect* aDragRect) {
  if (!mDragValid) return false;

  aSurface = mDnDVisualization.forget();
  *aDragRect = mDragRect;
  mDragValid = false;
  return true;
}

bool TabParent::AsyncPanZoomEnabled() const {
  nsCOMPtr<nsIWidget> widget = GetWidget();
  return widget && widget->AsyncPanZoomEnabled();
}

void TabParent::StartPersistence(uint64_t aOuterWindowID,
                                 nsIWebBrowserPersistDocumentReceiver* aRecv,
                                 ErrorResult& aRv) {
  nsCOMPtr<nsIContentParent> manager = Manager();
  if (!manager->IsContentParent()) {
    aRv.Throw(NS_ERROR_UNEXPECTED);
    return;
  }
  auto* actor = new WebBrowserPersistDocumentParent();
  actor->SetOnReady(aRecv);
  bool ok =
      manager->AsContentParent()->SendPWebBrowserPersistDocumentConstructor(
          actor, this, aOuterWindowID);
  if (!ok) {
    aRv.Throw(NS_ERROR_FAILURE);
  }
  // (The actor will be destroyed on constructor failure.)
}

NS_IMETHODIMP
TabParent::StartApzAutoscroll(float aAnchorX, float aAnchorY,
                              nsViewID aScrollId, uint32_t aPresShellId,
                              bool* aOutRetval) {
  if (!AsyncPanZoomEnabled()) {
    *aOutRetval = false;
    return NS_OK;
  }

  bool success = false;
  if (mRenderFrame.IsInitialized()) {
    layers::LayersId layersId = mRenderFrame.GetLayersId();
    if (nsCOMPtr<nsIWidget> widget = GetWidget()) {
      ScrollableLayerGuid guid{layersId, aPresShellId, aScrollId};

      // The anchor coordinates that are passed in are relative to the origin
      // of the screen, but we are sending them to APZ which only knows about
      // coordinates relative to the widget, so convert them accordingly.
      CSSPoint anchorCss{aAnchorX, aAnchorY};
      LayoutDeviceIntPoint anchor =
          RoundedToInt(anchorCss * widget->GetDefaultScale());
      anchor -= widget->WidgetToScreenOffset();

      success = widget->StartAsyncAutoscroll(
          ViewAs<ScreenPixel>(
              anchor, PixelCastJustification::LayoutDeviceIsScreenForBounds),
          guid);
    }
  }
  *aOutRetval = success;
  return NS_OK;
}

NS_IMETHODIMP
TabParent::StopApzAutoscroll(nsViewID aScrollId, uint32_t aPresShellId) {
  if (!AsyncPanZoomEnabled()) {
    return NS_OK;
  }

  if (mRenderFrame.IsInitialized()) {
    layers::LayersId layersId = mRenderFrame.GetLayersId();
    if (nsCOMPtr<nsIWidget> widget = GetWidget()) {
      ScrollableLayerGuid guid{layersId, aPresShellId, aScrollId};
      widget->StopAsyncAutoscroll(guid);
    }
  }
  return NS_OK;
}

ShowInfo TabParent::GetShowInfo() {
  TryCacheDPIAndScale();
  if (mFrameElement) {
    nsAutoString name;
    mFrameElement->GetAttr(kNameSpaceID_None, nsGkAtoms::name, name);
    bool allowFullscreen =
        mFrameElement->HasAttr(kNameSpaceID_None, nsGkAtoms::allowfullscreen) ||
        mFrameElement->HasAttr(kNameSpaceID_None,
                               nsGkAtoms::mozallowfullscreen);
    bool isPrivate = mFrameElement->HasAttr(kNameSpaceID_None,
                                            nsGkAtoms::mozprivatebrowsing);
    bool isTransparent =
        nsContentUtils::IsChromeDoc(mFrameElement->OwnerDoc()) &&
        mFrameElement->HasAttr(kNameSpaceID_None, nsGkAtoms::transparent);
    return ShowInfo(name, allowFullscreen, isPrivate, false, isTransparent,
                    mDPI, mRounding, mDefaultScale.scale);
  }

  return ShowInfo(EmptyString(), false, false, false, false, mDPI, mRounding,
                  mDefaultScale.scale);
}

mozilla::ipc::IPCResult TabParent::RecvLookUpDictionary(
    const nsString& aText, nsTArray<FontRange>&& aFontRangeArray,
    const bool& aIsVertical, const LayoutDeviceIntPoint& aPoint) {
  nsCOMPtr<nsIWidget> widget = GetWidget();
  if (!widget) {
    return IPC_OK();
  }

  widget->LookUpDictionary(aText, aFontRangeArray, aIsVertical,
                           aPoint - GetChildProcessOffset());
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvShowCanvasPermissionPrompt(
    const nsCString& aFirstPartyURI, const bool& aHideDoorHanger) {
  nsCOMPtr<nsIBrowser> browser =
      mFrameElement ? mFrameElement->AsBrowser() : nullptr;
  if (!browser) {
    // If the tab is being closed, the browser may not be available.
    // In this case we can ignore the request.
    return IPC_OK();
  }
  nsCOMPtr<nsIObserverService> os = services::GetObserverService();
  if (!os) {
    return IPC_FAIL_NO_REASON(this);
  }
  nsresult rv = os->NotifyObservers(
      browser,
      aHideDoorHanger ? "canvas-permissions-prompt-hide-doorhanger"
                      : "canvas-permissions-prompt",
      NS_ConvertUTF8toUTF16(aFirstPartyURI).get());
  if (NS_FAILED(rv)) {
    return IPC_FAIL_NO_REASON(this);
  }
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvVisitURI(
    const URIParams& aURI, const OptionalURIParams& aLastVisitedURI,
    const uint32_t& aFlags) {
  nsCOMPtr<nsIURI> ourURI = DeserializeURI(aURI);
  if (!ourURI) {
    return IPC_FAIL_NO_REASON(this);
  }
  nsCOMPtr<nsIURI> ourLastVisitedURI = DeserializeURI(aLastVisitedURI);
  RefPtr<nsIWidget> widget = GetWidget();
  if (NS_WARN_IF(!widget)) {
    return IPC_OK();
  }
  nsCOMPtr<IHistory> history = services::GetHistoryService();
  if (history) {
    Unused << history->VisitURI(widget, ourURI, ourLastVisitedURI, aFlags);
  }
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvQueryVisitedState(
    InfallibleTArray<URIParams>&& aURIs) {
#ifdef MOZ_ANDROID_HISTORY
  nsCOMPtr<IHistory> history = services::GetHistoryService();
  if (NS_WARN_IF(!history)) {
    return IPC_OK();
  }
  RefPtr<nsIWidget> widget = GetWidget();
  if (NS_WARN_IF(!widget)) {
    return IPC_OK();
  }

  nsTArray<nsCOMPtr<nsIURI>> uris(aURIs.Length());
  for (size_t i = 0; i < aURIs.Length(); ++i) {
    nsCOMPtr<nsIURI> uri = DeserializeURI(aURIs[i]);
    if (NS_WARN_IF(!uri)) {
      continue;
    }
    uris.AppendElement(uri);
  }

  GeckoViewHistory* gvHistory = static_cast<GeckoViewHistory*>(history.get());
  gvHistory->QueryVisitedState(widget, uris);

  return IPC_OK();
#else
  return IPC_FAIL(this, "QueryVisitedState is Android-only");
#endif
}

void TabParent::LiveResizeStarted() { SuppressDisplayport(true); }

void TabParent::LiveResizeStopped() { SuppressDisplayport(false); }

/* static */ size_t TabParent::gNumActiveRecordReplayTabs;

void TabParent::SetIsActiveRecordReplayTab(bool aIsActive) {
  if (aIsActive != mIsActiveRecordReplayTab) {
    gNumActiveRecordReplayTabs += aIsActive ? 1 : -1;
    mIsActiveRecordReplayTab = aIsActive;
  }
}

mozilla::ipc::IPCResult TabParent::RecvSetSystemFont(
    const nsCString& aFontName) {
  nsCOMPtr<nsIWidget> widget = GetWidget();
  if (widget) {
    widget->SetSystemFont(aFontName);
  }
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvGetSystemFont(nsCString* aFontName) {
  nsCOMPtr<nsIWidget> widget = GetWidget();
  if (widget) {
    widget->GetSystemFont(*aFontName);
  }
  return IPC_OK();
}

mozilla::ipc::IPCResult TabParent::RecvRootBrowsingContext(
    const BrowsingContextId& aId) {
  MOZ_ASSERT(!mBrowsingContext, "May only set browsing context once!");
  mBrowsingContext = CanonicalBrowsingContext::Get(aId);
  MOZ_ASSERT(mBrowsingContext, "Invalid ID!");
  return IPC_OK();
}

NS_IMETHODIMP
FakeChannel::OnAuthAvailable(nsISupports* aContext,
                             nsIAuthInformation* aAuthInfo) {
  nsAuthInformationHolder* holder =
      static_cast<nsAuthInformationHolder*>(aAuthInfo);

  if (!net::gNeckoChild->SendOnAuthAvailable(
          mCallbackId, holder->User(), holder->Password(), holder->Domain())) {
    return NS_ERROR_FAILURE;
  }
  return NS_OK;
}

NS_IMETHODIMP
FakeChannel::OnAuthCancelled(nsISupports* aContext, bool userCancel) {
  if (!net::gNeckoChild->SendOnAuthCancelled(mCallbackId, userCancel)) {
    return NS_ERROR_FAILURE;
  }
  return NS_OK;
}

}  // namespace dom
}  // namespace mozilla