process all ui events before posting closure because menu depends

chrome/browser/automation/ui_controls_win.cc

Index: chrome/browser/automation/ui_controls_win.cc
diff --git a/chrome/browser/automation/ui_controls_win.cc b/chrome/browser/automation/ui_controls_win.cc
index 5d2c873157d4cd9f4e078ab5974d471957e97097..744928f37e649430a019981c959c4be8254b321a 100644
--- a/chrome/browser/automation/ui_controls_win.cc
+++ b/chrome/browser/automation/ui_controls_win.cc
@@ -5,6 +5,7 @@
 #include "chrome/browser/automation/ui_controls.h"
 
 #include "base/callback.h"
+#include "base/message_loop.h"
 #include "chrome/browser/automation/ui_controls_internal.h"
 #include "ui/gfx/point.h"
 #include "ui/views/view.h"
@@ -65,4 +66,9 @@ void MoveMouseToCenterAndPress(views::View* view,
   SendMouseEventsNotifyWhenDone(button, state, task);
 }
 
+void RunClosureAfterAllPendingUIEvents(const base::Closure& closure) {
+  // On windows, posting UI events is synchronous so just post the closure.
+  MessageLoopForUI::current()->PostTask(FROM_HERE, closure);
+}
+
 }  // ui_controls