Add OrderingBarrierCHROMIUM API.

gpu/command_buffer/service/command_buffer_service.cc

 // Copyright (c) 2012 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/logging.h"
 #include "base/trace_event/trace_event.h"
@@ skipping 61 matching lines @@
     error_ = gpu::error::kOutOfBounds;
     return;
   }
 
   put_offset_ = put_offset;
 
   if (!put_offset_change_callback_.is_null())
     put_offset_change_callback_.Run();
 }
 
+void CommandBufferService::OrderingBarrier(int32 put_offset) {
+  Flush(put_offset);
+}
+
 void CommandBufferService::SetGetBuffer(int32 transfer_buffer_id) {
   DCHECK_EQ(-1, ring_buffer_id_);
   DCHECK_EQ(put_offset_, get_offset_);  // Only if it's empty.
   // If the buffer is invalid we handle it gracefully.
   // This means ring_buffer_ can be NULL.
   ring_buffer_ = GetTransferBuffer(transfer_buffer_id);
   ring_buffer_id_ = transfer_buffer_id;
   int32 size = ring_buffer_.get() ? ring_buffer_->size() : 0;
   num_entries_ = size / sizeof(CommandBufferEntry);
   put_offset_ = 0;
@@ skipping 93 matching lines @@
     const GetBufferChangedCallback& callback) {
   get_buffer_change_callback_ = callback;
 }
 
 void CommandBufferService::SetParseErrorCallback(
     const base::Closure& callback) {
   parse_error_callback_ = callback;
 }
 
 }  // namespace gpu