Bug 1325428 - Disable bfcache for WebVR pages r=smaug

MozReview-Commit-ID: fymOSOEoDC

--HG--
extra : rebase_source : 111b3b6e5ba3e83e59cbe46244e080e4d42c9746

dom/base/nsDocument.cpp

@@ -8579,14 +8579,18 @@ nsDocument::CanSavePresentation(nsIRequest *aNewRequest)
     }
   }
 
-#ifdef MOZ_WEBSPEECH
+
   if (win) {
     auto* globalWindow = nsGlobalWindow::Cast(win);
+#ifdef MOZ_WEBSPEECH
     if (globalWindow->HasActiveSpeechSynthesis()) {
       return false;
     }
-  }
 #endif
+    if (globalWindow->HasUsedVR()) {
+      return false;
+    }
+  }
 
   return true;
 }

dom/base/nsGlobalWindow.cpp

@@ -13239,6 +13239,14 @@ nsGlobalWindow::NotifyVREventListenerAdded()
   EnableVRUpdates();
 }
 
+bool
+nsGlobalWindow::HasUsedVR() const
+{
+  MOZ_ASSERT(IsInnerWindow());
+
+  return mHasVREvents;
+}
+
 void
 nsGlobalWindow::EnableTimeChangeNotifications()
 {

dom/base/nsGlobalWindow.h

@@ -448,6 +448,7 @@ public:
   // Inner windows only.
   virtual void SetHasGamepadEventListener(bool aHasGamepad = true) override;
   void NotifyVREventListenerAdded();
+  bool HasUsedVR() const;
   virtual void EventListenerAdded(nsIAtom* aType) override;
 
   // nsIInterfaceRequestor