Send vsync timebase updates to the browser compositor

content/common/gpu/client/command_buffer_proxy_impl.h

Index: content/common/gpu/client/command_buffer_proxy_impl.h
diff --git a/content/common/gpu/client/command_buffer_proxy_impl.h b/content/common/gpu/client/command_buffer_proxy_impl.h
index 8a7a6b4c45e514b54fd56fa0ac4958ef29d4bc33..12359e4970628d9f3f49eb27db2cd5a544ed75c5 100644
--- a/content/common/gpu/client/command_buffer_proxy_impl.h
+++ b/content/common/gpu/client/command_buffer_proxy_impl.h
@@ -71,6 +71,8 @@ class CommandBufferProxyImpl
   virtual void SetMemoryAllocationChangedCallback(
       const base::Callback<void(const GpuMemoryAllocationForRenderer&)>&
           callback) OVERRIDE;
+  virtual void SetUpdateVSyncTimeCallback(
+      const base::Callback<void(int64)>& callback) OVERRIDE;
   virtual bool SetParent(CommandBufferProxy* parent_command_buffer,
                          uint32 parent_texture_id) OVERRIDE;
   virtual void SetChannelErrorCallback(const base::Closure& callback) OVERRIDE;
@@ -123,6 +125,7 @@ class CommandBufferProxyImpl
   void OnConsoleMessage(const GPUCommandBufferConsoleMessage& message);
   void OnSetMemoryAllocation(const GpuMemoryAllocationForRenderer& allocation);
   void OnSignalSyncPointAck(uint32 id);
+  void OnUpdateVSyncTime(int64 time);
 
   // Try to read an updated copy of the state from shared memory.
   void TryUpdateState();
@@ -157,6 +160,8 @@ class CommandBufferProxyImpl
   base::Callback<void(const GpuMemoryAllocationForRenderer&)>
       memory_allocation_changed_callback_;
 
+  base::Callback<void(int64)> update_vsync_time_callback_;
+
   GpuConsoleMessageCallback console_message_callback_;
 
   // Tasks to be invoked in SignalSyncPoint responses.