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

chrome/gpu/gpu_command_buffer_stub.cc

 // 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.
 
 #if defined(ENABLE_GPU)
 
 #include "base/process_util.h"
 #include "base/shared_memory.h"
 #include "build/build_config.h"
 #include "chrome/common/child_thread.h"
@@ skipping 271 matching lines @@
   Send(new GpuCommandBufferMsg_UpdateState(route_id_, state));
 }
 
 void GpuCommandBufferStub::OnFlush(int32 put_offset,
                                    gpu::CommandBuffer::State* state) {
 #if defined(OS_MACOSX)
   // See comment in |DidDestroySurface()| in gpu_processor_mac.cc.
   if (channel_->IsRenderViewGone(render_view_id_))
     processor_->DidDestroySurface();
 #endif
-  *state = command_buffer_->Flush(put_offset);
+  *state = command_buffer_->FlushSync(put_offset);
 }
 
 void GpuCommandBufferStub::OnAsyncFlush(int32 put_offset) {
-  gpu::CommandBuffer::State state = command_buffer_->Flush(put_offset);
+  gpu::CommandBuffer::State state = command_buffer_->FlushSync(put_offset);
   Send(new GpuCommandBufferMsg_UpdateState(route_id_, state));
 }
 
 void GpuCommandBufferStub::OnCreateTransferBuffer(int32 size, int32* id) {
   *id = command_buffer_->CreateTransferBuffer(size);
 }
 
 void GpuCommandBufferStub::OnDestroyTransferBuffer(int32 id) {
   command_buffer_->DestroyTransferBuffer(id);
 }
@@ skipping 77 matching lines @@
       new GpuHostMsg_ResizeXID(handle_, size, &result));
 #elif defined(OS_WIN)
   HWND hwnd = static_cast<HWND>(compositor_window_);
   UINT swp_flags = SWP_NOSENDCHANGING | SWP_NOOWNERZORDER | SWP_NOCOPYBITS |
     SWP_NOMOVE | SWP_NOZORDER | SWP_NOACTIVATE | SWP_DEFERERASE;
   SetWindowPos(hwnd, NULL, 0, 0, size.width(), size.height(), swp_flags);
 #endif  // defined(OS_LINUX)
 }
 
 #endif  // defined(ENABLE_GPU)