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

chrome/browser/nacl_host/nacl_process_host.h

Index: chrome/browser/nacl_host/nacl_process_host.h
===================================================================
--- chrome/browser/nacl_host/nacl_process_host.h	(revision 133072)
+++ chrome/browser/nacl_host/nacl_process_host.h	(working copy)
@@ -6,6 +6,8 @@
 #define CHROME_BROWSER_NACL_HOST_NACL_PROCESS_HOST_H_
 #pragma once
 
+#include <string>
+
 #include "build/build_config.h"
 
 #include "base/file_path.h"
@@ -137,6 +139,8 @@
   // Socket pairs for the NaCl process and renderer.
   scoped_ptr<NaClInternal> internal_;
 
+  std::string ppapi_channel_name_;
+
   base::WeakPtrFactory<NaClProcessHost> weak_factory_;
 
   scoped_ptr<content::BrowserChildProcessHost> process_;