cc: Introduce BeginFrame sequence numbers and acknowledgements.

content/browser/renderer_host/compositor_impl_android.h

Index: content/browser/renderer_host/compositor_impl_android.h
diff --git a/content/browser/renderer_host/compositor_impl_android.h b/content/browser/renderer_host/compositor_impl_android.h
index e18b3f58e539868103c1b23f7a9232523e25d279..1530644a2d6733d44558a0d34a99ecdb79a4bbae 100644
--- a/content/browser/renderer_host/compositor_impl_android.h
+++ b/content/browser/renderer_host/compositor_impl_android.h
@@ -53,21 +53,11 @@ class CONTENT_EXPORT CompositorImpl
       public ui::UIResourceProvider,
       public ui::WindowAndroidCompositor {
  public:
-  class VSyncObserver {
-   public:
-    virtual void OnVSync(base::TimeTicks timebase,
-                         base::TimeDelta interval) = 0;
-  };
-
   CompositorImpl(CompositorClient* client, gfx::NativeWindow root_window);
   ~CompositorImpl() override;
 
   static bool IsInitialized();
 
-  void AddObserver(VSyncObserver* observer);
-  void RemoveObserver(VSyncObserver* observer);
-  void OnNeedsBeginFramesChange(bool needs_begin_frames);
-
   // ui::ResourceProvider implementation.
   cc::UIResourceId CreateUIResource(cc::UIResourceClient* client) override;
   void DeleteUIResource(cc::UIResourceId resource_id) override;
@@ -112,8 +102,6 @@ class CONTENT_EXPORT CompositorImpl
   void AttachLayerForReadback(scoped_refptr<cc::Layer> layer) override;
   void RequestCopyOfOutputOnRootLayer(
       std::unique_ptr<cc::CopyOutputRequest> request) override;
-  void OnVSync(base::TimeTicks frame_time,
-               base::TimeDelta vsync_period) override;
   void SetNeedsAnimate() override;
   cc::FrameSinkId GetFrameSinkId() override;
 
@@ -146,7 +134,6 @@ class CONTENT_EXPORT CompositorImpl
   scoped_refptr<cc::Layer> readback_layer_tree_;
 
   // Destruction order matters here:
-  base::ObserverList<VSyncObserver, true> observer_list_;
   std::unique_ptr<cc::AnimationHost> animation_host_;
   std::unique_ptr<cc::LayerTreeHost> host_;
   ui::ResourceManagerImpl resource_manager_;
@@ -180,7 +167,6 @@ class CONTENT_EXPORT CompositorImpl
   bool compositor_frame_sink_request_pending_;
 
   gpu::Capabilities gpu_capabilities_;
-  bool needs_begin_frames_;
   base::WeakPtrFactory<CompositorImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(CompositorImpl);