WebVR: handle window.rAF while presenting

third_party/WebKit/Source/modules/vr/VRDisplay.h

Index: third_party/WebKit/Source/modules/vr/VRDisplay.h
diff --git a/third_party/WebKit/Source/modules/vr/VRDisplay.h b/third_party/WebKit/Source/modules/vr/VRDisplay.h
index 16dead3e91412fcc91c619032c2c18ad0ba7448c..323a19d8d45901fc4dc49baf5e8a7dbb99bb792c 100644
--- a/third_party/WebKit/Source/modules/vr/VRDisplay.h
+++ b/third_party/WebKit/Source/modules/vr/VRDisplay.h
@@ -140,6 +140,7 @@ class VRDisplay final : public EventTargetWithInlineData,
   void ConnectVSyncProvider();
   void OnVSyncConnectionError();
 
+  bool IsPresentationFocused();
   ScriptedAnimationController& EnsureScriptedAnimationController(Document*);
   void ProcessScheduledAnimations(double timestamp);
   void ProcessScheduledWindowAnimations(double timestamp);
@@ -179,7 +180,7 @@ class VRDisplay final : public EventTargetWithInlineData,
   RefPtr<Image> previous_image_;
 
   Member<ScriptedAnimationController> scripted_animation_controller_;
-  bool pending_raf_ = false;
+  bool pending_vrdisplay_raf_ = false;
   bool pending_vsync_ = false;
   bool in_animation_frame_ = false;
   bool in_display_activate_ = false;