gpu: Reuse transfer buffers more aggresively

gpu/command_buffer/service/command_buffer_service.h

Index: gpu/command_buffer/service/command_buffer_service.h
diff --git a/gpu/command_buffer/service/command_buffer_service.h b/gpu/command_buffer/service/command_buffer_service.h
index b1f8fa15fea6a2d3da4a9681f8dad587a01d6c35..06ea9588418b00d60e8864345bbd2982e4fbae46 100644
--- a/gpu/command_buffer/service/command_buffer_service.h
+++ b/gpu/command_buffer/service/command_buffer_service.h
@@ -36,6 +36,7 @@ class GPU_EXPORT CommandBufferService : public CommandBuffer {
   virtual void DestroyTransferBuffer(int32 id) OVERRIDE;
   virtual Buffer GetTransferBuffer(int32 id) OVERRIDE;
   virtual void SetToken(int32 token) OVERRIDE;
+  virtual void SetSerial(uint32 serial) OVERRIDE;
   virtual void SetParseError(error::Error error) OVERRIDE;
   virtual void SetContextLostReason(error::ContextLostReason) OVERRIDE;
 
@@ -79,6 +80,7 @@ class GPU_EXPORT CommandBufferService : public CommandBuffer {
   base::Closure parse_error_callback_;
   TransferBufferManagerInterface* transfer_buffer_manager_;
   int32 token_;
+  uint32 serial_;
   uint32 generation_;
   error::Error error_;
   error::ContextLostReason context_lost_reason_;