PPAPI: Make CompletionCallbacks work right on background threads.

ppapi/proxy/plugin_globals.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ppapi/proxy/plugin_globals.h"
 
 #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"
@@ skipping 87 matching lines @@
 void PluginGlobals::BroadcastLogWithSource(PP_Module /* module */,
                                            PP_LogLevel_Dev level,
                                            const std::string& source,
                                            const std::string& value) {
   // Since we have only one module in a plugin process, broadcast is always
   // the same as "send to everybody" which is what the dispatcher implements
   // for the "instance = 0" case.
   LogWithSource(0, level, source, value);
 }
 
+MessageLoopShared* PluginGlobals::GetCurrentMessageLoop() {
+  return MessageLoopResource::GetCurrent();
+}
+
 MessageLoopResource* PluginGlobals::loop_for_main_thread() {
   return loop_for_main_thread_.get();
 }
 
 bool PluginGlobals::IsPluginGlobals() const {
   return true;
 }
 
 }  // namespace proxy
 }  // namespace ppapi