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 133072)
+++ ppapi/native_client/src/trusted/plugin/service_runtime.cc	(working copy)
@@ -635,7 +635,8 @@
                           "ServiceRuntime: failed to create sel_ldr launcher");
     return false;
   }
-  if (!tmp_subprocess->Start(url.c_str())) {
+  PP_Instance instance = plugin_->pp_instance();
+  if (!tmp_subprocess->Start(instance, url.c_str())) {
     PLUGIN_PRINTF(("ServiceRuntime::Start (start failed)\n"));
     error_info->SetReport(ERROR_SEL_LDR_LAUNCH,
                           "ServiceRuntime: failed to start");