Context menu on views must show on mouse down for non-WIN.

ui/views/controls/menu/menu_controller.h

Index: ui/views/controls/menu/menu_controller.h
diff --git a/ui/views/controls/menu/menu_controller.h b/ui/views/controls/menu/menu_controller.h
index 6d2e5fb0a13d2f6dd1b326c00099634c492d1b69..badd97b5216cc0a6ec832456de92095dbbcbcb0d 100644
--- a/ui/views/controls/menu/menu_controller.h
+++ b/ui/views/controls/menu/menu_controller.h
@@ -136,6 +136,9 @@ class VIEWS_EXPORT MenuController : public MessageLoop::Dispatcher,
   // WidgetObserver overrides:
   virtual void OnWidgetDestroying(Widget* widget) OVERRIDE;
 
+  // Only used for testing.
+  static void TurnOffContextMenuSelectionHoldForTest();
+
  private:
   friend class internal::MenuRunnerImpl;
   friend class MenuHostRootView;
@@ -567,6 +570,9 @@ class VIEWS_EXPORT MenuController : public MessageLoop::Dispatcher,
   // The timestamp of the event which closed the menu - or 0 otherwise.
   base::TimeDelta closing_event_time_;
 
+  // Time when the menu is first shown.
+  base::TimeTicks menu_start_time_;
+
   DISALLOW_COPY_AND_ASSIGN(MenuController);
 };