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

remoting/host/event_executor_mac.h

 // 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.
 
 #ifndef REMOTING_HOST_EVENT_EXECUTOR_MAC_H_
 #define REMOTING_HOST_EVENT_EXECUTOR_MAC_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "remoting/host/event_executor.h"
 #include "remoting/protocol/input_stub.h"
 
 namespace remoting {
 
 // A class to generate events on Mac.
 class EventExecutorMac : public protocol::InputStub {
  public:
-  EventExecutorMac(MessageLoop* message_loop, Capturer* capturer);
+  EventExecutorMac(MessageLoopForUI* message_loop, Capturer* capturer);
   virtual ~EventExecutorMac();
 
   virtual void InjectKeyEvent(const protocol::KeyEvent* event, Task* done);
   virtual void InjectMouseEvent(const protocol::MouseEvent* event, Task* done);
 
  private:
-  MessageLoop* message_loop_;
+  MessageLoopForUI* message_loop_;
   Capturer* capturer_;
 
   DISALLOW_COPY_AND_ASSIGN(EventExecutorMac);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_EVENT_EXECUTOR_MAC_H_