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

remoting/host/chromoting_host_context.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_CHROMOTING_HOST_CONTEXT_H_
 #define REMOTING_HOST_CHROMOTING_HOST_CONTEXT_H_
 
 #include <string>
 
 #include "base/gtest_prod_util.h"
 #include "base/threading/thread.h"
 #include "remoting/jingle_glue/jingle_thread.h"
 
 namespace remoting {
 
 // A class that manages threads and running context for the chromoting host
 // process.
 class ChromotingHostContext {
  public:
-  ChromotingHostContext();
+  // Create a context attached to the specified ui message loop. Since there
+  // can only be one such loop on UNIX platforms, it has to be passed into
+  // this object rather than being owned by it.
+  explicit ChromotingHostContext(MessageLoop* ui_message_loop);
   virtual ~ChromotingHostContext();
 
   // TODO(ajwong): Move the Start/Stop methods out of this class. Then
   // create a static factory for construction, and destruction.  We
   // should be able to remove the need for virtual functions below with that
   // design, while preserving the relative simplicity of this API.
   virtual void Start();
   virtual void Stop();
 
   virtual JingleThread* jingle_thread();
 
   virtual MessageLoop* main_message_loop();
   virtual MessageLoop* encode_message_loop();
   virtual MessageLoop* network_message_loop();
+  MessageLoop* ui_message_loop();
 
  private:
   FRIEND_TEST_ALL_PREFIXES(ChromotingHostContextTest, StartAndStop);
 
   // A thread that hosts all network operations.
   JingleThread jingle_thread_;
 
   // A thread that hosts ChromotingHost and performs rate control.
   base::Thread main_thread_;
 
   // A thread that hosts all encode operations.
   base::Thread encode_thread_;
 
+  // The main message loop.
+  MessageLoop* ui_message_loop_;
+
   DISALLOW_COPY_AND_ASSIGN(ChromotingHostContext);
 };
 
 }  // namespace remoting
 
 DISABLE_RUNNABLE_METHOD_REFCOUNT(remoting::ChromotingHostContext);
 
 #endif  // REMOTING_HOST_CHROMOTING_HOST_CONTEXT_H_