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

gpu/command_buffer/service/command_buffer_service.cc

 // 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.
 
 #include "gpu/command_buffer/service/command_buffer_service.h"
 
 #include <limits>
 
 #include "base/callback.h"
 #include "gpu/command_buffer/common/cmd_buffer_common.h"
@@ skipping 59 matching lines @@
   State state;
   state.num_entries = num_entries_;
   state.get_offset = get_offset_;
   state.put_offset = put_offset_;
   state.token = token_;
   state.error = error_;
 
   return state;
 }
 
-CommandBufferService::State CommandBufferService::Flush(int32 put_offset) {
+CommandBufferService::State CommandBufferService::FlushSync(int32 put_offset) {
   if (put_offset < 0 || put_offset > num_entries_) {
     error_ = gpu::error::kOutOfBounds;
     return GetState();
   }
 
   put_offset_ = put_offset;
 
   if (put_offset_change_callback_.get()) {
     put_offset_change_callback_->Run();
   }
 
   return GetState();
 }
 
+void CommandBufferService::Flush(int32 put_offset) {
+  FlushSync(put_offset);
+}
+
 void CommandBufferService::SetGetOffset(int32 get_offset) {
   DCHECK(get_offset >= 0 && get_offset < num_entries_);
   get_offset_ = get_offset;
 }
 
 int32 CommandBufferService::CreateTransferBuffer(size_t size) {
   linked_ptr<SharedMemory> buffer(new SharedMemory);
   if (!buffer->CreateAnonymous(size))
     return -1;
 
@@ skipping 67 matching lines @@
     error_ = error;
   }
 }
 
 void CommandBufferService::SetPutOffsetChangeCallback(
     Callback0::Type* callback) {
   put_offset_change_callback_.reset(callback);
 }
 
 }  // namespace gpu