MailboxSync: Imply fence with sync point

gpu/command_buffer/service/in_process_command_buffer.h

 // Copyright 2013 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 GPU_COMMAND_BUFFER_SERVICE_IN_PROCESS_COMMAND_BUFFER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_IN_PROCESS_COMMAND_BUFFER_H_
 
 #include <map>
 #include <vector>
 
@@ skipping 163 matching lines @@
   void ScheduleIdleWorkOnGpuThread();
   uint32 CreateStreamTextureOnGpuThread(uint32 client_texture_id);
   bool MakeCurrent();
   base::Closure WrapCallback(const base::Closure& callback);
   State GetStateFast();
   void QueueTask(const base::Closure& task) { service_->ScheduleTask(task); }
   void CheckSequencedThread();
   void RetireSyncPointOnGpuThread(uint32 sync_point);
   void SignalSyncPointOnGpuThread(uint32 sync_point,
                                   const base::Closure& callback);
+  bool WaitSyncPointOnGpuThread(uint32 sync_point);
   void SignalQueryOnGpuThread(unsigned query_id, const base::Closure& callback);
   void DestroyTransferBufferOnGpuThread(int32 id);
 
   // Callbacks:
   void OnContextLost();
   void OnResizeView(gfx::Size size, float scale_factor);
   bool GetBufferChanged(int32 transfer_buffer_id);
   void PumpCommands();
   void PerformIdleWork();
 
@@ skipping 34 matching lines @@
 
   base::WeakPtr<InProcessCommandBuffer> gpu_thread_weak_ptr_;
   base::WeakPtrFactory<InProcessCommandBuffer> gpu_thread_weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(InProcessCommandBuffer);
 };
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_IN_PROCESS_COMMAND_BUFFER_H_