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

device/vr/test/fake_vr_device.cc

Index: device/vr/test/fake_vr_device.cc
diff --git a/device/vr/test/fake_vr_device.cc b/device/vr/test/fake_vr_device.cc
index c699905019dff22bee1b1b63e2c6d2f13e57e77e..9595e5ffbd270b9bebc8ecbfb8f4be9460a3087d 100644
--- a/device/vr/test/fake_vr_device.cc
+++ b/device/vr/test/fake_vr_device.cc
@@ -62,7 +62,8 @@ void FakeVRDevice::GetVRDevice(
 
 void FakeVRDevice::ResetPose() {}
 
-void FakeVRDevice::RequestPresent(const base::Callback<void(bool)>& callback) {
+void FakeVRDevice::RequestPresent(mojom::VRSubmitFrameClientPtr submit_client,
+                                  const base::Callback<void(bool)>& callback) {
   callback.Run(true);
 }
 
@@ -72,11 +73,14 @@ void FakeVRDevice::ExitPresent() {
   OnExitPresent();
 }
 
-void FakeVRDevice::SubmitFrame(mojom::VRPosePtr pose) {}
+void FakeVRDevice::SubmitFrame(int16_t frame_index,
+                               const gpu::MailboxHolder& mailbox) {}
 
 void FakeVRDevice::UpdateLayerBounds(int16_t frame_index,
                                      mojom::VRLayerBoundsPtr leftBounds,
-                                     mojom::VRLayerBoundsPtr rightBounds) {}
+                                     mojom::VRLayerBoundsPtr rightBounds,
+                                     int16_t source_width,
+                                     int16_t source_height) {}
 
 void FakeVRDevice::GetVRVSyncProvider(mojom::VRVSyncProviderRequest request) {}