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

base/message_loop.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 "base/message_loop.h"
 
+#if defined(OS_POSIX) && !defined(OS_MACOSX)
+#include <gdk/gdk.h>
+#include <gdk/gdkx.h>
+#endif
+
 #include <algorithm>
 
 #include "base/compiler_specific.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/message_pump_default.h"
 #include "base/metrics/histogram.h"
 #include "base/third_party/dynamic_annotations/dynamic_annotations.h"
 #include "base/threading/thread_local.h"
 
@@ skipping 640 matching lines @@
 
 //------------------------------------------------------------------------------
 // MessageLoopForUI
 
 #if defined(OS_WIN)
 void MessageLoopForUI::DidProcessMessage(const MSG& message) {
   pump_win()->DidProcessMessage(message);
 }
 #endif  // defined(OS_WIN)
 
+#if defined(OS_POSIX) && !defined(OS_MACOSX)
+Display* MessageLoopForUI::get_display()
+{
+  return gdk_x11_get_default_xdisplay();
+}
+#endif
+
 #if !defined(OS_MACOSX) && !defined(OS_NACL)
 void MessageLoopForUI::AddObserver(Observer* observer) {
   pump_ui()->AddObserver(observer);
 }
 
 void MessageLoopForUI::RemoveObserver(Observer* observer) {
   pump_ui()->RemoveObserver(observer);
 }
 
 void MessageLoopForUI::Run(Dispatcher* dispatcher) {
@@ skipping 25 matching lines @@
                                            Watcher *delegate) {
   return pump_libevent()->WatchFileDescriptor(
       fd,
       persistent,
       static_cast<base::MessagePumpLibevent::Mode>(mode),
       controller,
       delegate);
 }
 
 #endif