Remove GpuHostMsg_FrameDrawn and replace with client channel swap ack

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 dd08222957ab24724e62189a252f8311c4205894..9c2bcdbd483958ee292f37e2f908891d3c57e948 100644
--- a/content/common/gpu/client/command_buffer_proxy_impl.h
+++ b/content/common/gpu/client/command_buffer_proxy_impl.h
@@ -130,7 +130,10 @@ class CommandBufferProxyImpl
   void SetOnConsoleMessageCallback(
       const GpuConsoleMessageCallback& callback);
 
-  void SetLatencyInfo(const std::vector<ui::LatencyInfo>& latency_info);
+  typedef base::Callback<void(const std::vector<ui::LatencyInfo>& latency_info)>
+      SwapBuffersCompletionCallback;
+  void SetLatencyInfo(const std::vector<ui::LatencyInfo>& latency_info,
+                      const SwapBuffersCompletionCallback& callback);
 
   // TODO(apatrick): this is a temporary optimization while skia is calling
   // ContentGLContext::MakeCurrent prior to every GL call. It saves returning 6
@@ -161,6 +164,7 @@ class CommandBufferProxyImpl
   void OnConsoleMessage(const GPUCommandBufferConsoleMessage& message);
   void OnSetMemoryAllocation(const gpu::MemoryAllocation& allocation);
   void OnSignalSyncPointAck(uint32 id);
+  void OnSwapBuffersCompleted(const std::vector<ui::LatencyInfo>& latency_info);
 
   // Try to read an updated copy of the state from shared memory.
   void TryUpdateState();
@@ -201,6 +205,8 @@ class CommandBufferProxyImpl
 
   std::vector<ui::LatencyInfo> latency_info_;
 
+  SwapBuffersCompletionCallback swap_buffers_completion_callback_;
+
   DISALLOW_COPY_AND_ASSIGN(CommandBufferProxyImpl);
 };