Add an IPC channel between the NaCl loader process and the renderer.

chrome/nacl/nacl_listener.h

 // 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.
 
 #ifndef CHROME_NACL_NACL_LISTENER_H_
 #define CHROME_NACL_NACL_LISTENER_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 29 matching lines @@
 
   // A filter that allows other threads to use the channel.
   scoped_refptr<IPC::SyncMessageFilter> filter_;
 
   base::WaitableEvent shutdown_event_;
   base::Thread io_thread_;
 
   // Used to identify what thread we're on.
   MessageLoop* main_loop_;
 
+  scoped_ptr<IPC::SyncChannel> ppapi_channel_;
+
   bool debug_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(NaClListener);
 };
 
 #endif  // CHROME_NACL_NACL_LISTENER_H_