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 143480)
+++ chrome/browser/nacl_host/nacl_process_host.h	(working copy)
@@ -17,6 +17,7 @@
 #include "chrome/common/nacl_types.h"
 #include "content/public/browser/browser_child_process_host_delegate.h"
 #include "googleurl/src/gurl.h"
+#include "ipc/ipc_channel_handle.h"
 
 class ChromeRenderMessageFilter;
 class CommandLine;
@@ -86,7 +87,7 @@
 
   // Sends the reply message to the renderer who is waiting for the plugin
   // to load. Returns true on success.
-  bool ReplyToRenderer();
+  bool ReplyToRenderer(const IPC::ChannelHandle& channel_handle);
 
   // Sends the message to the NaCl process to load the plugin. Returns true
   // on success.
@@ -113,6 +114,8 @@
                                    IPC::Message* reply_msg);
 #endif
 
+  void OnPpapiChannelCreated(const IPC::ChannelHandle& channel_handle);
+
   GURL manifest_url_;
 
 #if defined(OS_WIN)
@@ -152,6 +155,8 @@
 
   bool off_the_record_;
 
+  bool enable_ipc_proxy_;
+
   DISALLOW_COPY_AND_ASSIGN(NaClProcessHost);
 };