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

gpu/pgl/command_buffer_pepper.h

 // Copyright (c) 2010 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_PGL_COMMAND_BUFFER_PEPPER_H
 #define GPU_PGL_COMMAND_BUFFER_PEPPER_H
 
 #include "gpu/command_buffer/common/command_buffer.h"
 #include "third_party/npapi/bindings/npapi.h"
 #include "third_party/npapi/bindings/npruntime.h"
@@ skipping 11 matching lines @@
  public:
   CommandBufferPepper(NPP npp,
                       NPDevice* device,
                       NPDeviceContext3D* device_context);
   virtual ~CommandBufferPepper();
 
   // CommandBuffer implementation.
   virtual bool Initialize(int32 size);
   virtual gpu::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 gpu::Buffer GetTransferBuffer(int32 handle);
   virtual void SetToken(int32 token);
   virtual void SetParseError(gpu::error::Error error);
 
   gpu::error::Error GetCachedError();
 
  private:
   CommandBuffer::State ConvertState();
 
   NPP npp_;
   NPDevice* device_;
   NPDeviceContext3D* context_;
 };
 
 #endif  // GPU_PGL_COMMAND_BUFFER_PEPPER_H