Run event executor on the ui thread to remove the need to explicitly XFlush() the XTest calls.

remoting/host/event_executor_mac.cc

 // Copyright (c) 2010 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 "remoting/host/event_executor_mac.h"
 
 #include "base/message_loop.h"
 #include "base/task.h"
 #include "remoting/protocol/message_decoder.h"
 
 namespace remoting {
 
 using protocol::MouseEvent;
 using protocol::KeyEvent;
 
 EventExecutorMac::EventExecutorMac(
-    MessageLoop* message_loop, Capturer* capturer)
+    MessageLoopForUI* message_loop, Capturer* capturer)
     : message_loop_(message_loop),
       capturer_(capturer) {
 }
 
 EventExecutorMac::~EventExecutorMac() {
 }
 
 void EventExecutorMac::InjectKeyEvent(const KeyEvent* event, Task* done) {
   done->Run();
   delete done;
 }
 
 void EventExecutorMac::InjectMouseEvent(const MouseEvent* event, Task* done) {
   done->Run();
   delete done;
 }
 
-protocol::InputStub* CreateEventExecutor(MessageLoop* message_loop,
+protocol::InputStub* CreateEventExecutor(MessageLoopForUI* message_loop,
                                          Capturer* capturer) {
   return new EventExecutorMac(message_loop, capturer);
 }
 
 }  // namespace remoting