PPAPI: Make PPB_MessageLoop_Dev::GetForMainThread work

ppapi/proxy/plugin_globals.cc

Index: ppapi/proxy/plugin_globals.cc
diff --git a/ppapi/proxy/plugin_globals.cc b/ppapi/proxy/plugin_globals.cc
index cfc3b791382f4c912c112cf23a75f572347d07ed..1b192b3b3667aec090288fa74292d7f86fe6f175 100644
--- a/ppapi/proxy/plugin_globals.cc
+++ b/ppapi/proxy/plugin_globals.cc
@@ -6,6 +6,7 @@
 
 #include "ppapi/proxy/plugin_dispatcher.h"
 #include "ppapi/proxy/plugin_proxy_delegate.h"
+#include "ppapi/proxy/ppb_message_loop_proxy.h"
 #include "ppapi/thunk/enter.h"
 
 namespace ppapi {
@@ -16,7 +17,9 @@ PluginGlobals* PluginGlobals::plugin_globals_ = NULL;
 PluginGlobals::PluginGlobals()
     : ppapi::PpapiGlobals(),
       plugin_proxy_delegate_(NULL),
-      callback_tracker_(new CallbackTracker) {
+      callback_tracker_(new CallbackTracker),
+      loop_for_main_thread_(
+          new MessageLoopResource(MessageLoopResource::ForMainThread())) {
   DCHECK(!plugin_globals_);
   plugin_globals_ = this;
 }
@@ -48,6 +51,10 @@ CallbackTracker* PluginGlobals::GetCallbackTrackerForInstance(
   return callback_tracker_.get();
 }
 
+MessageLoopResource* PluginGlobals::loop_for_main_thread() {
+  return loop_for_main_thread_.get();
+}
+
 thunk::PPB_Instance_API* PluginGlobals::GetInstanceAPI(PP_Instance instance) {
   PluginDispatcher* dispatcher = PluginDispatcher::GetForInstance(instance);
   if (dispatcher)