process all ui events before posting closure because menu depends

chrome/browser/automation/ui_controls_gtk.cc

Index: chrome/browser/automation/ui_controls_gtk.cc
diff --git a/chrome/browser/automation/ui_controls_gtk.cc b/chrome/browser/automation/ui_controls_gtk.cc
index 32e31007ee601fd9b4757592318f0960bcc4574b..8826609eaab1b6024c99bf6f499f0e7dde349966 100644
--- a/chrome/browser/automation/ui_controls_gtk.cc
+++ b/chrome/browser/automation/ui_controls_gtk.cc
@@ -310,4 +310,13 @@ void MoveMouseToCenterAndPress(GtkWidget* widget,
 }
 #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