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

device/vr/vr_display_impl.cc

 // Copyright 2016 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 <utility>
 
 #include "base/bind.h"
 #include "device/vr/vr_device.h"
 #include "device/vr/vr_service_impl.h"
 
@@ skipping 58 matching lines @@
   if (device_->CheckPresentingDisplay(this))
     device_->ExitPresent();
 }
 
 void VRDisplayImpl::SubmitFrame(mojom::VRPosePtr pose) {
   if (!device_->CheckPresentingDisplay(this))
     return;
   device_->SubmitFrame(std::move(pose));
 }
 
-void VRDisplayImpl::UpdateLayerBounds(mojom::VRLayerBoundsPtr left_bounds,
+void VRDisplayImpl::UpdateLayerBounds(uint32_t frame_index,
+                                      mojom::VRLayerBoundsPtr left_bounds,
                                       mojom::VRLayerBoundsPtr right_bounds) {
   if (!device_->IsAccessAllowed(this))
     return;
 
-  device_->UpdateLayerBounds(std::move(left_bounds), std::move(right_bounds));
+  device_->UpdateLayerBounds(frame_index, std::move(left_bounds),
+                             std::move(right_bounds));
 }
 }