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..16ddcdf9c4133bf37b27c0476500d07df6495a68 100644
--- a/device/vr/test/fake_vr_device.h
+++ b/device/vr/test/fake_vr_device.h
@@ -27,13 +27,17 @@ class FakeVRDevice : public VRDevice {
       const base::Callback<void(mojom::VRDisplayInfoPtr)>& callback) override;
   void ResetPose() override;
 
-  void RequestPresent(const base::Callback<void(bool)>& callback) override;
+  void RequestPresent(mojom::VRSubmitFrameClientPtr submit_client,
+                      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::MailboxHolder& mailbox) 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: