Added command buffer implementation of WebGL which runs in the sandbox....

chrome/common/render_messages_internal.h

 // 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.
 
 // This header is meant to be included in multiple passes, hence no traditional
 // header guard.
 // See ipc_message_macros.h for explanation of the macros and passes.
 
 #include <map>
 #include <string>
@@ skipping 1324 matching lines @@
                               std::wstring /* locale */,
                               IPC::ChannelHandle /* handle to channel */,
                               WebPluginInfo /* info */)
 
   // A renderer sends this to the browser process when it wants to
   // create connect to the GPU.  The browser will create the GPU process if
   // necessary, and will return a handle to the channel via
   // a GpuChannelEstablished message.
   IPC_MESSAGE_CONTROL0(ViewHostMsg_EstablishGpuChannel)
 
+  // A renderer sends this to the browser process to provide a synchronization
+  // point for GPU operations, in particular to make sure the GPU channel has
+  // been established.
+  IPC_SYNC_MESSAGE_CONTROL0_0(ViewHostMsg_SynchronizeGpu)
+
   // A renderer sends this to the browser process when it wants to start
   // a new instance of the Native Client process. The browser will launch
   // the process and return a handle to an IMC channel.
   IPC_SYNC_MESSAGE_CONTROL2_3(ViewHostMsg_LaunchNaCl,
                               std::wstring /* url for the NaCl module */,
                               int /* channel number */,
                               nacl::FileDescriptor /* imc channel handle */,
                               base::ProcessHandle /* NaCl process handle */,
                               base::ProcessId /* NaCl process id */)
 
@@ skipping 923 matching lines @@
                        int /* render_view_id */,
                        int /* bridge_id */)
 
   // The |render_view_id| and |bridge_id| requests Geolocation service to
   // resume.
   IPC_MESSAGE_CONTROL2(ViewHostMsg_Geolocation_Resume,
                        int /* render_view_id */,
                        int /* bridge_id */)
 
 IPC_END_MESSAGES(ViewHost)