Re-land^2 WebVR compositor bypass via BrowserMain context + mailbox

device/vr/android/gvr/gvr_device.h

Index: device/vr/android/gvr/gvr_device.h
diff --git a/device/vr/android/gvr/gvr_device.h b/device/vr/android/gvr/gvr_device.h
index 55fb95f3b5babad5ebcf1c519d66ab7bd55c4017..5aec12cae29776d6103438a1f0a959ef0bfb3b2d 100644
--- a/device/vr/android/gvr/gvr_device.h
+++ b/device/vr/android/gvr/gvr_device.h
@@ -27,10 +27,15 @@ class DEVICE_VR_EXPORT GvrDevice : public VRDevice {
   void SetSecureOrigin(bool secure_origin) override;
   void ExitPresent() override;
 
-  void SubmitFrame(mojom::VRPosePtr pose) override;
+  void SubmitFrame(int16_t frame_index,
+                   const gpu::Mailbox& mailbox,
+                   const gpu::SyncToken& sync_token,
+                   mojom::VRSubmitFrameClientPtr submit_client) override;
   void UpdateLayerBounds(int16_t frame_index,
                          mojom::VRLayerBoundsPtr left_bounds,
-                         mojom::VRLayerBoundsPtr right_bounds) override;
+                         mojom::VRLayerBoundsPtr right_bounds,
+                         int16_t source_width,
+                         int16_t source_height) override;
   void GetVRVSyncProvider(mojom::VRVSyncProviderRequest request) override;
   void OnDelegateChanged();