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

device/vr/android/gvr/gvr_delegate.h

 // 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.
 
 #ifndef DEVICE_VR_ANDROID_GVR_DELEGATE_H
 #define DEVICE_VR_ANDROID_GVR_DELEGATE_H
 
 #include "device/vr/android/gvr/gvr_device_provider.h"
 #include "device/vr/vr_export.h"
 #include "device/vr/vr_service.mojom.h"
 #include "third_party/gvr-android-sdk/src/libraries/headers/vr/gvr/capi/include/gvr_types.h"
 
 namespace gvr {
 class GvrApi;
 }  // namespace gvr
 
 namespace device {
 
 constexpr gvr::Sizei kInvalidRenderTargetSize = {0, 0};
 
 class DEVICE_VR_EXPORT GvrDelegate {
  public:
   virtual void SetWebVRSecureOrigin(bool secure_origin) = 0;
   virtual void SubmitWebVRFrame() = 0;
-  virtual void UpdateWebVRTextureBounds(const gvr::Rectf& left_bounds,
+  virtual void UpdateWebVRTextureBounds(int16_t frame_index,
+                                        const gvr::Rectf& left_bounds,
                                         const gvr::Rectf& right_bounds) = 0;
   virtual gvr::Sizei GetWebVRCompositorSurfaceSize() = 0;
   virtual void SetWebVRRenderSurfaceSize(int width, int height) = 0;
   // TODO(mthiesse): This function is not threadsafe. crbug.com/674594
   virtual gvr::GvrApi* gvr_api() = 0;
   virtual void OnVRVsyncProviderRequest(
       mojom::VRVSyncProviderRequest request) = 0;
   virtual void UpdateVSyncInterval(long timebase_nanos,
                                    double interval_seconds) = 0;
 
@@ skipping 17 matching lines @@
  protected:
   virtual ~GvrDelegateProvider() {}
 
  private:
   static GvrDelegateProvider* delegate_provider_;
 };
 
 }  // namespace device
 
 #endif  // DEVICE_VR_ANDROID_GVR_DELEGATE_H