Rework FlushSync to return early if commands have been processed since the last update

gpu/pgl/command_buffer_pepper.h

-// Copyright (c) 2011 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"
-#include "third_party/npapi/bindings/npapi_extensions.h"
-#ifdef __native_client__
-#include "native_client/src/third_party/npapi/files/include/npupp.h"
-#else
-#include "third_party/npapi/bindings/nphostapi.h"
-#endif  // __native_client__
-
-namespace {
-class SharedMemory;
-}
-
-// A CommandBuffer proxy implementation that uses the Pepper API to access
-// the command buffer.
-
-class CommandBufferPepper : public gpu::CommandBuffer {
- public:
-  CommandBufferPepper(NPP npp,
-                      NPDevice* device,
-                      NPDeviceContext3D* device_context);
-  virtual ~CommandBufferPepper();
-
-  // CommandBuffer implementation.
-  virtual bool Initialize(int32 size);
-  virtual bool Initialize(base::SharedMemory* buffer, int32 size);
-  virtual gpu::Buffer GetRingBuffer();
-  virtual State GetState();
-  virtual void Flush(int32 put_offset);
-  virtual State FlushSync(int32 put_offset);
-  virtual void SetGetOffset(int32 get_offset);
-  virtual int32 CreateTransferBuffer(size_t size, int32 id_request);
-  virtual void DestroyTransferBuffer(int32 id);
-  virtual gpu::Buffer GetTransferBuffer(int32 handle);
-  virtual int32 RegisterTransferBuffer(base::SharedMemory* shared_memory,
-                                       size_t size,
-                                       int32 id_request);
-  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