process all ui events before posting closure because menu depends

chrome/browser/automation/ui_controls_gtk.cc

 // Copyright (c) 2011 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 "chrome/browser/automation/ui_controls.h"
 
 #include <gdk/gdkkeysyms.h>
 #include <gtk/gtk.h>
 
 #include "base/bind.h"
@@ skipping 292 matching lines @@
                                int state,
                                const base::Closure& task) {
   gfx::Rect bounds = gtk_util::GetWidgetScreenBounds(widget);
   SendMouseMoveNotifyWhenDone(
       bounds.x() + bounds.width() / 2,
       bounds.y() + bounds.height() / 2,
       base::Bind(&ui_controls::internal::ClickTask, button, state, task));
 }
 #endif
 
+#if defined(TOOLKIT_VIEWS)
+void RunClosureAfterAllPendingUIEvents(const base::Closure& task) {
+  // Send noop event and run task.
+  int x, y;
+  gdk_window_at_pointer(&x, &y);
+  SendMouseMoveNotifyWhenDone(x, y, task);
+}
+#endif
+
 }  // namespace ui_controls