Add OrderingBarrierCHROMIUM API.

ppapi/proxy/ppapi_command_buffer_proxy.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 "ppapi/proxy/ppapi_command_buffer_proxy.h"
 
 #include "ppapi/proxy/ppapi_messages.h"
 #include "ppapi/proxy/proxy_channel.h"
 #include "ppapi/shared_impl/api_id.h"
 #include "ppapi/shared_impl/host_resource.h"
@@ skipping 42 matching lines @@
   IPC::Message* message = new PpapiHostMsg_PPBGraphics3D_AsyncFlush(
       ppapi::API_ID_PPB_GRAPHICS_3D, resource_, put_offset);
 
   // Do not let a synchronous flush hold up this message. If this handler is
   // deferred until after the synchronous flush completes, it will overwrite the
   // cached last_state_ with out-of-date data.
   message->set_unblock(true);
   Send(message);
 }
 
+void PpapiCommandBufferProxy::OrderingBarrier(int32 put_offset) {
+  Flush(put_offset);
+}
+
 void PpapiCommandBufferProxy::WaitForTokenInRange(int32 start, int32 end) {
   TryUpdateState();
   if (!InRange(start, end, last_state_.token) &&
       last_state_.error == gpu::error::kNoError) {
     bool success = false;
     gpu::CommandBuffer::State state;
     if (Send(new PpapiHostMsg_PPBGraphics3D_WaitForTokenInRange(
              ppapi::API_ID_PPB_GRAPHICS_3D,
              resource_,
              start,
@@ skipping 173 matching lines @@
     shared_state()->Read(&last_state_);
 }
 
 gpu::CommandBufferSharedState* PpapiCommandBufferProxy::shared_state() const {
   return reinterpret_cast<gpu::CommandBufferSharedState*>(
       shared_state_shm_->memory());
 }
 
 }  // namespace proxy
 }  // namespace ppapi