Make CommandBuffer::Flush asynchronous, and add CommandBuffer::FlushSync with former semantics.

gpu/command_buffer/service/command_buffer_service.h

 // Copyright (c) 2009 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_COMMAND_BUFFER_SERVICE_H_
 #define GPU_COMMAND_BUFFER_SERVICE_COMMAND_BUFFER_SERVICE_H_
 
 #include <set>
 #include <vector>
 
@@ skipping 10 matching lines @@
 // API to manage the put and get pointers.
 class CommandBufferService : public CommandBuffer {
  public:
   CommandBufferService();
   virtual ~CommandBufferService();
 
   // CommandBuffer implementation:
   virtual bool Initialize(int32 size);
   virtual Buffer GetRingBuffer();
   virtual State GetState();
-  virtual State Flush(int32 put_offset);
+  virtual void Flush(int32 put_offset);
+  virtual State FlushSync(int32 put_offset);
   virtual void SetGetOffset(int32 get_offset);
   virtual int32 CreateTransferBuffer(size_t size);
   virtual void DestroyTransferBuffer(int32 id);
   virtual Buffer GetTransferBuffer(int32 handle);
   virtual void SetToken(int32 token);
   virtual void SetParseError(error::Error error);
 
   // Sets a callback that should be posted on another thread whenever the put
   // offset is changed. The callback must not return until some progress has
   // been made (unless the command buffer is empty), i.e. the
@@ skipping 14 matching lines @@
   scoped_ptr<Callback0::Type> put_offset_change_callback_;
   std::vector<linked_ptr< base::SharedMemory> > registered_objects_;
   std::set<int32> unused_registered_object_elements_;
   int32 token_;
   error::Error error_;
 };
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_COMMAND_BUFFER_SERVICE_H_