Ozone: Avoid blocking in Swapbuffer Call.

content/common/gpu/gpu_command_buffer_stub.h

 // Copyright (c) 2012 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 CONTENT_COMMON_GPU_GPU_COMMAND_BUFFER_STUB_H_
 #define CONTENT_COMMON_GPU_GPU_COMMAND_BUFFER_STUB_H_
 
 #include <deque>
 #include <string>
 #include <vector>
@@ skipping 128 matching lines @@
 
   void SetPreemptByFlag(scoped_refptr<gpu::PreemptionFlag> flag);
 
   void SetLatencyInfoCallback(const LatencyInfoCallback& callback);
 
   void MarkContextLost();
 
   uint64 GetMemoryUsage() const;
 
   void SwapBuffersCompleted(const std::vector<ui::LatencyInfo>& latency_info);
+  void PageFlipCompleted();
 
  private:
   GpuMemoryManager* GetMemoryManager() const;
   bool MakeCurrent();
   void Destroy();
 
   // Cleans up and sends reply if OnInitialize failed.
   void OnInitializeFailed(IPC::Message* reply_message);
 
   // Message handlers:
@@ skipping 120 matching lines @@
   size_t total_gpu_memory_;
   scoped_ptr<WaitForCommandState> wait_for_token_;
   scoped_ptr<WaitForCommandState> wait_for_get_offset_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuCommandBufferStub);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_GPU_COMMAND_BUFFER_STUB_H_