Implement WebVR presentation pausing for VR Shell Menu Mode

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 9b12cfecda8be5b9be99b98cad360617536d2b87..02cd277533b1329941159359b6e3ddd4d47df302 100644
--- a/third_party/WebKit/Source/modules/vr/VRDisplay.h
+++ b/third_party/WebKit/Source/modules/vr/VRDisplay.h
@@ -69,6 +69,9 @@ class VRDisplay final : public GarbageCollectedFinalized<VRDisplay>,
   void cancelAnimationFrame(int id);
   void serviceScriptedAnimations(double monotonicAnimationStartTime);
 
+  void pausePresent();
+  void resumePresent();
+
   ScriptPromise requestPresent(ScriptState*, const HeapVector<VRLayer>& layers);
   ScriptPromise exitPresent(ScriptState*);
 
@@ -106,7 +109,6 @@ class VRDisplay final : public GarbageCollectedFinalized<VRDisplay>,
   bool m_isConnected;
   bool m_isPresenting;
   bool m_canUpdateFramePose;
-  unsigned m_compositorHandle;
   Member<VRDisplayCapabilities> m_capabilities;
   Member<VRStageParameters> m_stageParameters;
   Member<VREyeParameters> m_eyeParametersLeft;