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

ppapi/native_client/src/trusted/plugin/service_runtime.cc

Index: ppapi/native_client/src/trusted/plugin/service_runtime.cc
===================================================================
--- ppapi/native_client/src/trusted/plugin/service_runtime.cc	(revision 143480)
+++ ppapi/native_client/src/trusted/plugin/service_runtime.cc	(working copy)
@@ -623,7 +623,9 @@
 }
 
 bool ServiceRuntime::Start(nacl::DescWrapper* nacl_desc,
-                           ErrorInfo* error_info, const nacl::string& url) {
+                           ErrorInfo* error_info,
+                           const nacl::string& url,
+                           void** ipc_channel_handle) {
   PLUGIN_PRINTF(("ServiceRuntime::Start (nacl_desc=%p)\n",
                  reinterpret_cast<void*>(nacl_desc)));
 
@@ -643,7 +645,9 @@
 #ifdef NACL_STANDALONE
   bool started = tmp_subprocess->Start(url.c_str());
 #else
-  bool started = tmp_subprocess->Start(plugin_->pp_instance(), url.c_str());
+  bool started = tmp_subprocess->Start(plugin_->pp_instance(),
+                                       url.c_str(),
+                                       ipc_channel_handle);
 #endif
   if (!started) {
     PLUGIN_PRINTF(("ServiceRuntime::Start (start failed)\n"));