gpu: Reuse transfer buffers more aggresively

ppapi/proxy/ppapi_command_buffer_proxy.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 PPAPI_PROXY_COMMAND_BUFFER_PROXY_H_
 #define PPAPI_PROXY_COMMAND_BUFFER_PROXY_H_
 
 #include "base/callback.h"
 #include "base/containers/hash_tables.h"
 #include "gpu/command_buffer/common/command_buffer.h"
@@ skipping 23 matching lines @@
   virtual State GetLastState() OVERRIDE;
   virtual int32 GetLastToken() OVERRIDE;
   virtual void Flush(int32 put_offset) OVERRIDE;
   virtual State FlushSync(int32 put_offset, int32 last_known_get) OVERRIDE;
   virtual void SetGetBuffer(int32 transfer_buffer_id) OVERRIDE;
   virtual void SetGetOffset(int32 get_offset) OVERRIDE;
   virtual gpu::Buffer CreateTransferBuffer(size_t size, int32* id) OVERRIDE;
   virtual void DestroyTransferBuffer(int32 id) OVERRIDE;
   virtual gpu::Buffer GetTransferBuffer(int32 id) OVERRIDE;
   virtual void SetToken(int32 token) OVERRIDE;
+  virtual void SetSerial(uint32 serial) OVERRIDE;
   virtual void SetParseError(gpu::error::Error error) OVERRIDE;
   virtual void SetContextLostReason(gpu::error::ContextLostReason reason)
       OVERRIDE;
 
   // gpu::GpuControl implementation:
   virtual gpu::Capabilities GetCapabilities() OVERRIDE;
   virtual gfx::GpuMemoryBuffer* CreateGpuMemoryBuffer(
       size_t width,
       size_t height,
       unsigned internalformat,
@@ skipping 25 matching lines @@
 
   base::Closure channel_error_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(PpapiCommandBufferProxy);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif // PPAPI_PROXY_COMMAND_BUFFER_PROXY_H_