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 135227)
+++ 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"
@@ -84,14 +86,6 @@
 
   void IrtReady();
 
-  // Sends the reply message to the renderer who is waiting for the plugin
-  // to load. Returns true on success.
-  bool ReplyToRenderer();
-
-  // Sends the message to the NaCl process to load the plugin. Returns true
-  // on success.
-  bool StartNaClExecution();
-
   // Called once all initialization is complete and the NaCl process is
   // ready to go. Returns true on success.
   bool SendStart();
@@ -113,6 +107,8 @@
                                    IPC::Message* reply_msg);
 #endif
 
+  void OnPpapiChannelCreated(const IPC::ChannelHandle& channel_handle);
+
   GURL manifest_url_;
 
 #if defined(OS_WIN)