Bug 1613237 - Call nsIWebBrowserChrome3 for main process pages. r=kmag,esawin

nsContentTreeOwner uses XULBrowserWindow (which is Desktop-only) to get the
current WebBrowserChrome instance.

This patch adds a lookup for the WebBrowserChrome actor to make sure that the
correct instance is queried on all platforms.

Differential Revision: https://phabricator.services.mozilla.com/D62817

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

mobile/android/components/geckoview/GeckoViewStartup.js

@@ -31,6 +31,7 @@ const ACTORS = {
     child: {
       moduleURI: "resource:///actors/WebBrowserChromeChild.jsm",
     },
+    includeChrome: true,
   },
 };
 

xpfe/appshell/nsContentTreeOwner.cpp

@@ -33,6 +33,7 @@
 #include "mozilla/NullPrincipal.h"
 #include "nsDocShell.h"
 #include "nsDocShellLoadState.h"
+#include "nsQueryActor.h"
 
 #include "nsIScriptObjectPrincipal.h"
 #include "nsIURI.h"
@@ -71,6 +72,28 @@ class nsSiteWindow : public nsIEmbeddingSiteWindow {
   nsContentTreeOwner* mAggregator;
 };
 
+already_AddRefed<nsIWebBrowserChrome3>
+nsContentTreeOwner::GetWebBrowserChrome() {
+  if (!mAppWindow) {
+    return nullptr;
+  }
+
+  nsCOMPtr<nsIDocShell> docShell;
+  mAppWindow->GetDocShell(getter_AddRefs(docShell));
+
+  if (!docShell) {
+    return nullptr;
+  }
+
+  nsCOMPtr<nsPIDOMWindowOuter> outer(docShell->GetWindow());
+  if (nsCOMPtr<nsIWebBrowserChrome3> chrome =
+          do_QueryActor(u"WebBrowserChrome", outer)) {
+    return chrome.forget();
+  }
+
+  return nullptr;
+}
+
 //*****************************************************************************
 //***    nsContentTreeOwner: Object Management
 //*****************************************************************************
@@ -151,6 +174,13 @@ NS_IMETHODIMP nsContentTreeOwner::GetInterface(const nsIID& aIID,
     return mAppWindow->QueryInterface(aIID, aSink);
   }
 
+  if (aIID.Equals(NS_GET_IID(nsIWebBrowserChrome3))) {
+    if (nsCOMPtr<nsIWebBrowserChrome3> chrome = GetWebBrowserChrome()) {
+      chrome.forget(aSink);
+      return NS_OK;
+    }
+  }
+
   return QueryInterface(aIID, aSink);
 }
 

xpfe/appshell/nsContentTreeOwner.h

@@ -49,6 +49,9 @@ class nsContentTreeOwner final : public nsIDocShellTreeOwner,
   void AppWindow(mozilla::AppWindow* aAppWindow);
   mozilla::AppWindow* AppWindow();
 
+ private:
+  already_AddRefed<nsIWebBrowserChrome3> GetWebBrowserChrome();
+
  protected:
   mozilla::AppWindow* mAppWindow;
   nsSiteWindow* mSiteWindow;