Allow VRDisplay to specify which frame the layer bounds should be updated at.

device/vr/test/fake_vr_device.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "device/vr/test/fake_vr_device.h"
 
 namespace device {
 
 FakeVRDevice::FakeVRDevice() {
   device_ = mojom::VRDisplayInfo::New();
@@ skipping 55 matching lines @@
 }
 
 void FakeVRDevice::SetSecureOrigin(bool secure_origin) {}
 
 void FakeVRDevice::ExitPresent() {
   OnExitPresent();
 }
 
 void FakeVRDevice::SubmitFrame(mojom::VRPosePtr pose) {}
 
-void FakeVRDevice::UpdateLayerBounds(mojom::VRLayerBoundsPtr leftBounds,
+void FakeVRDevice::UpdateLayerBounds(int16_t frame_index,
+                                     mojom::VRLayerBoundsPtr leftBounds,
                                      mojom::VRLayerBoundsPtr rightBounds) {}
 
 void FakeVRDevice::GetVRVSyncProvider(mojom::VRVSyncProviderRequest request) {}
 
 }  // namespace device