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

ppapi/native_client/src/trusted/plugin/plugin.h

Index: ppapi/native_client/src/trusted/plugin/plugin.h
===================================================================
--- ppapi/native_client/src/trusted/plugin/plugin.h	(revision 143037)
+++ ppapi/native_client/src/trusted/plugin/plugin.h	(working copy)
@@ -517,6 +517,8 @@
   const FileDownloader* FindFileDownloader(PP_Resource url_loader) const;
 
   int64_t time_of_last_progress_event_;
+
+  bool started_ipc_proxy_;

[Mark Seaborn, 2012/06/20 19:24:40]

Would 'using_ipc_proxy_' be more appropriate?  "started" suggests this is used
for starting something only if it's not already started.

[bbudge, 2012/06/21 00:00:46]

Done.

 };
 
 }  // namespace plugin