Bug 1620172 - Use GetActiveBrowsingContext for full screen auto-exit. r=NeilDeakin

Differential Revision: https://phabricator.services.mozilla.com/D66009

--HG--
extra : moz-landing-system : lando

dom/base/nsFocusManager.cpp

@@ -1404,13 +1404,28 @@ void nsFocusManager::SetFocusInner(Element* aNewContent, int32_t aFlags,
   if (StaticPrefs::full_screen_api_exit_on_windowRaise() &&
       !isElementInActiveWindow &&
       aFlags & (FLAG_RAISE | FLAG_NONSYSTEMCALLER)) {
-    // TODO mActiveWindow in content process
-    if (Document* doc = mActiveWindow ? mActiveWindow->GetDoc() : nullptr) {
-      if (doc->GetFullscreenElement()) {
-        if (XRE_IsParentProcess()) {
+    if (XRE_IsParentProcess()) {
+      if (Document* doc = mActiveWindow ? mActiveWindow->GetDoc() : nullptr) {
+        if (doc->GetFullscreenElement()) {
           LogWarningFullscreenWindowRaise(mFocusedElement);
+          Document::AsyncExitFullscreen(doc);
+        }
+      }
+    } else {
+      BrowsingContext* activeBrowsingContext = GetActiveBrowsingContext();
+      if (activeBrowsingContext) {
+        nsIDocShell* shell = activeBrowsingContext->GetDocShell();
+        if (shell) {
+          Document* doc = shell->GetDocument();
+          if (doc && doc->GetFullscreenElement()) {
+            Document::AsyncExitFullscreen(doc);
+          }
+        } else {
+          mozilla::dom::ContentChild* contentChild =
+              mozilla::dom::ContentChild::GetSingleton();
+          MOZ_ASSERT(contentChild);
+          contentChild->SendMaybeExitFullscreen(activeBrowsingContext);
         }
-        Document::AsyncExitFullscreen(doc);
       }
     }
   }

dom/ipc/ContentChild.cpp

@@ -4192,6 +4192,27 @@ mozilla::ipc::IPCResult ContentChild::RecvSetupFocusedAndActive(
   return IPC_OK();
 }
 
+mozilla::ipc::IPCResult ContentChild::RecvMaybeExitFullscreen(
+    const MaybeDiscarded<BrowsingContext>& aContext) {
+  if (aContext.IsNullOrDiscarded()) {
+    MOZ_LOG(BrowsingContext::GetLog(), LogLevel::Debug,
+            ("ChildIPC: Trying to send a message to dead or detached context"));
+    return IPC_OK();
+  }
+
+  nsIDocShell* shell = aContext.get()->GetDocShell();
+  if (!shell) {
+    return IPC_OK();
+  }
+
+  Document* doc = shell->GetDocument();
+  if (doc && doc->GetFullscreenElement()) {
+    Document::AsyncExitFullscreen(doc);
+  }
+
+  return IPC_OK();
+}
+
 mozilla::ipc::IPCResult ContentChild::RecvWindowPostMessage(
     const MaybeDiscarded<BrowsingContext>& aContext,
     const ClonedMessageData& aMessage, const PostMessageData& aData) {

dom/ipc/ContentChild.h

@@ -771,6 +771,8 @@ class ContentChild final
   mozilla::ipc::IPCResult RecvSetupFocusedAndActive(
       const MaybeDiscarded<BrowsingContext>& aFocusedBrowsingContext,
       const MaybeDiscarded<BrowsingContext>& aActiveBrowsingContext);
+  mozilla::ipc::IPCResult RecvMaybeExitFullscreen(
+      const MaybeDiscarded<BrowsingContext>& aContext);
 
   mozilla::ipc::IPCResult RecvWindowPostMessage(
       const MaybeDiscarded<BrowsingContext>& aContext,

dom/ipc/ContentParent.cpp

@@ -6358,6 +6358,25 @@ mozilla::ipc::IPCResult ContentParent::RecvBlurToParent(
   return IPC_OK();
 }
 
+mozilla::ipc::IPCResult ContentParent::RecvMaybeExitFullscreen(
+    const MaybeDiscarded<BrowsingContext>& aContext) {
+  if (aContext.IsNullOrDiscarded()) {
+    MOZ_LOG(
+        BrowsingContext::GetLog(), LogLevel::Debug,
+        ("ParentIPC: Trying to send a message to dead or detached context"));
+    return IPC_OK();
+  }
+  CanonicalBrowsingContext* context = aContext.get_canonical();
+
+  ContentProcessManager* cpm = ContentProcessManager::GetSingleton();
+
+  ContentParent* cp =
+      cpm->GetContentProcessById(ContentParentId(context->OwnerProcessId()));
+  Unused << cp->SendMaybeExitFullscreen(context);
+
+  return IPC_OK();
+}
+
 mozilla::ipc::IPCResult ContentParent::RecvWindowPostMessage(
     const MaybeDiscarded<BrowsingContext>& aContext,
     const ClonedMessageData& aMessage, const PostMessageData& aData) {

dom/ipc/ContentParent.h

@@ -670,6 +670,8 @@ class ContentParent final
       bool aIsLeavingDocument, bool aAdjustWidget,
       bool aBrowsingContextToClearHandled,
       bool aAncestorBrowsingContextToFocusHandled);
+  mozilla::ipc::IPCResult RecvMaybeExitFullscreen(
+      const MaybeDiscarded<BrowsingContext>& aContext);
 
   mozilla::ipc::IPCResult RecvWindowPostMessage(
       const MaybeDiscarded<BrowsingContext>& aContext,

dom/ipc/PContent.ipdl

@@ -1628,6 +1628,7 @@ child:
     async SetupFocusedAndActive(MaybeDiscardedBrowsingContext aFocusedBrowsingContext,
                                 MaybeDiscardedBrowsingContext aActiveBrowsingContext);
 both:
+    async MaybeExitFullscreen(MaybeDiscardedBrowsingContext aContext);
     async WindowPostMessage(MaybeDiscardedBrowsingContext aContext,
                             ClonedMessageData aMessage,
                             PostMessageData aData);