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

chrome/browser/android/vr_shell/vr_shell.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 CHROME_BROWSER_ANDROID_VR_SHELL_VR_SHELL_H_
 #define CHROME_BROWSER_ANDROID_VR_SHELL_VR_SHELL_H_
 
 #include <jni.h>
 
 #include <memory>
@@ skipping 103 matching lines @@
   // Perform a UI action triggered by the javascript API.
   void DoUiAction(const UiAction action);
 
   void SetContentCssSize(float width, float height, float dpr);
   void SetUiCssSize(float width, float height, float dpr);
 
   void ContentFrameWasResized(bool width_changed);
 
   void ForceExitVr();
 
-  static device::mojom::VRPosePtr VRPosePtrFromGvrPose(gvr::Mat4f head_mat,
-                                                       uint32_t pose_index);
+  static device::mojom::VRPosePtr VRPosePtrFromGvrPose(gvr::Mat4f head_mat);
 
  private:
   virtual ~VrShell();
   void SetShowingOverscrollGlow(bool showing_glow);
   void PostToGlThreadWhenReady(const base::Closure& task);
 
   // content::WebContentsObserver implementation.
   void RenderViewHostChanged(content::RenderViewHost* old_host,
                              content::RenderViewHost* new_host) override;
   void MainFrameWasResized(bool width_changed) override;
   void WebContentsDestroyed() override;
 
   // device::GvrDelegate implementation
   void SetWebVRSecureOrigin(bool secure_origin) override;
   void SubmitWebVRFrame() override;
-  void UpdateWebVRTextureBounds(const gvr::Rectf& left_bounds,
+  void UpdateWebVRTextureBounds(int16_t frame_index,
+                                const gvr::Rectf& left_bounds,
                                 const gvr::Rectf& right_bounds) override;
   gvr::GvrApi* gvr_api() override;
   void SetWebVRRenderSurfaceSize(int width, int height) override;
   gvr::Sizei GetWebVRCompositorSurfaceSize() override;
   void OnVRVsyncProviderRequest(
       device::mojom::VRVSyncProviderRequest request) override;
   void UpdateVSyncInterval(long timebase_nanos,
                            double interval_seconds) override;
 
   std::unique_ptr<UiInterface> html_interface_;
@@ skipping 19 matching lines @@
   base::WeakPtrFactory<VrShell> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(VrShell);
 };
 
 bool RegisterVrShell(JNIEnv* env);
 
 }  // namespace vr_shell
 
 #endif  // CHROME_BROWSER_ANDROID_VR_SHELL_VR_SHELL_H_