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

ppapi/proxy/ppb_context_3d_proxy.h

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// 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 PPAPI_PPB_CONTEXT_3D_PROXY_H_
 #define PPAPI_PPB_CONTEXT_3D_PROXY_H_
 
 #include <vector>
 
 #include "base/shared_memory.h"
 #include "gpu/command_buffer/common/command_buffer.h"
@@ skipping 81 matching lines @@
                          const HostResource& draw,
                          const HostResource& read,
                          int32_t* result);
   void OnMsgInitialize(const HostResource& context,
                        int32 size,
                        base::SharedMemoryHandle* ring_buffer);
   void OnMsgGetState(const HostResource& context,
                      gpu::CommandBuffer::State* state);
   void OnMsgFlush(const HostResource& context,
                   int32 put_offset,
+                  int32 last_known_get,
                   gpu::CommandBuffer::State* state);
   void OnMsgAsyncFlush(const HostResource& context,
                        int32 put_offset);
   void OnMsgCreateTransferBuffer(const HostResource& context,
                                  int32 size,
                                  int32* id);
   void OnMsgDestroyTransferBuffer(const HostResource& context,
                                   int32 id);
   void OnMsgGetTransferBuffer(const HostResource& context,
                               int32 id,
                               base::SharedMemoryHandle* transfer_buffer,
                               uint32* size);
 };
 
 }  // namespace proxy
 }  // namespace pp
 
 #endif  // PPAPI_PPB_CONTEXT_3D_PROXY_H_