gpu: Reuse transfer buffers more aggresively

gpu/command_buffer/service/gpu_scheduler.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 GPU_COMMAND_BUFFER_SERVICE_GPU_SCHEDULER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_GPU_SCHEDULER_H_
 
 #include <queue>
 
 #include "base/atomic_ref_count.h"
@@ skipping 67 matching lines @@
 
   typedef base::Callback<void(bool /* scheduled */)> SchedulingChangedCallback;
 
   // Sets a callback that is invoked just before scheduler is rescheduled
   // or descheduled. Takes ownership of callback object.
   void SetSchedulingChangedCallback(const SchedulingChangedCallback& callback);
 
   // Implementation of CommandBufferEngine.
   virtual Buffer GetSharedMemoryBuffer(int32 shm_id) OVERRIDE;
   virtual void set_token(int32 token) OVERRIDE;
+  virtual void set_async_token(uint32 token) OVERRIDE;
   virtual bool SetGetBuffer(int32 transfer_buffer_id) OVERRIDE;
   virtual bool SetGetOffset(int32 offset) OVERRIDE;
   virtual int32 GetGetOffset() OVERRIDE;
 
   void SetCommandProcessedCallback(const base::Closure& callback);
 
   void DeferToFence(base::Closure task);
 
   // Polls the fences, invoking callbacks that were waiting to be triggered
   // by them and returns whether all fences were complete.
@@ skipping 61 matching lines @@
   // If non-NULL and |preemption_flag_->IsSet()|, exit PutChanged early.
   scoped_refptr<PreemptionFlag> preemption_flag_;
   bool was_preempted_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuScheduler);
 };
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GPU_SCHEDULER_H_