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

chrome/browser/nacl_host/nacl_process_host.cc

Index: chrome/browser/nacl_host/nacl_process_host.cc
===================================================================
--- chrome/browser/nacl_host/nacl_process_host.cc	(revision 133072)
+++ chrome/browser/nacl_host/nacl_process_host.cc	(working copy)
@@ -516,6 +516,8 @@
     return;
   }
 
+  ppapi_channel_name_ = IPC::Channel::GenerateVerifiedChannelID("nacl");
+
   // Rather than creating a socket pair in the renderer, and passing
   // one side through the browser to sel_ldr, socket pairs are created
   // in the browser and then passed to the renderer and sel_ldr.
@@ -947,7 +949,8 @@
   base::ProcessId nacl_process_id = base::GetProcId(data.handle);
 
   ChromeViewHostMsg_LaunchNaCl::WriteReplyParams(
-      reply_msg_, handles_for_renderer, nacl_process_handle, nacl_process_id);
+      reply_msg_, handles_for_renderer, ppapi_channel_name_,
+      nacl_process_handle, nacl_process_id);
   chrome_render_message_filter_->Send(reply_msg_);
   chrome_render_message_filter_ = NULL;
   reply_msg_ = NULL;
@@ -959,6 +962,7 @@
   NaClBrowser* nacl_browser = NaClBrowser::GetInstance();
 
   nacl::NaClStartParams params;
+  params.ppapi_channel_name = ppapi_channel_name_;
   params.validation_cache_key = nacl_browser->GetValidatorCacheKey();
   params.version = chrome::VersionInfo().CreateVersionString();
   params.enable_exception_handling = enable_exception_handling_;