Implement WebVR presentation pausing for VR Shell Menu Mode

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

Index: third_party/WebKit/Source/modules/vr/VRController.h
diff --git a/third_party/WebKit/Source/modules/vr/VRController.h b/third_party/WebKit/Source/modules/vr/VRController.h
index 9c8b5b85f09bbc8588cff718159b02d1ab312247..19828754b1b0d252ffc1ad3f25a8f775885526e1 100644
--- a/third_party/WebKit/Source/modules/vr/VRController.h
+++ b/third_party/WebKit/Source/modules/vr/VRController.h
@@ -58,7 +58,9 @@ class VRController final : public GarbageCollectedFinalized<VRController>,
   void OnDisplayChanged(device::blink::VRDisplayPtr) override;
   void OnExitPresent(unsigned index) override;
   void OnDisplayConnected(device::blink::VRDisplayPtr) override;
-  void OnDisplayDisconnected(unsigned) override;
+  void OnDisplayDisconnected(unsigned index) override;
+  void OnPausePresent(unsigned index) override;
+  void OnResumePresent(unsigned index) override;
 
   // ContextLifecycleObserver.
   void contextDestroyed() override;