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

device/vr/test/fake_vr_device.h

Index: device/vr/test/fake_vr_device.h
diff --git a/device/vr/test/fake_vr_device.h b/device/vr/test/fake_vr_device.h
index 178610eaacccb3238c582e93013b4402d0da1806..78dea6a8122623b62c74a52aa4b507584d428e28 100644
--- a/device/vr/test/fake_vr_device.h
+++ b/device/vr/test/fake_vr_device.h
@@ -30,10 +30,15 @@ class FakeVRDevice : public VRDevice {
   void RequestPresent(const base::Callback<void(bool)>& callback) override;
   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 leftBounds,
-                         mojom::VRLayerBoundsPtr rightBounds) override;
+                         mojom::VRLayerBoundsPtr rightBounds,
+                         int16_t source_width,
+                         int16_t source_height) override;
   void GetVRVSyncProvider(mojom::VRVSyncProviderRequest request) override;
 
  private: