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

ui/views/controls/menu/menu_controller.h

 // Copyright (c) 2012 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.
 
 #ifndef UI_VIEWS_CONTROLS_MENU_MENU_CONTROLLER_H_
 #define UI_VIEWS_CONTROLS_MENU_MENU_CONTROLLER_H_
 
 #include "build/build_config.h"
 
 #include <list>
@@ skipping 118 matching lines @@
   // Invoked from the scroll buttons of the MenuScrollViewContainer.
   void OnDragEnteredScrollButton(SubmenuView* source, bool is_up);
   void OnDragExitedScrollButton(SubmenuView* source);
 
   // Update the submenu's selection based on the current mouse location
   void UpdateSubmenuSelection(SubmenuView* source);
 
   // WidgetObserver overrides:
   virtual void OnWidgetDestroying(Widget* widget) OVERRIDE;
 
+  // Only used for testing.
+  static void TurnOffContextMenuSelectionHoldForTest();
+
  private:
   friend class internal::MenuRunnerImpl;
   friend class MenuHostRootView;
   friend class MenuItemView;
   friend class SubmenuView;
 
   class MenuScrollTask;
 
   struct SelectByCharDetails;
 
@@ skipping 411 matching lines @@
 
   // How deep we are in nested message loops. This should be at most 2 (when
   // showing a context menu from a menu).
   int message_loop_depth_;
 
   views::MenuConfig menu_config_;
 
   // 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);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_MENU_MENU_CONTROLLER_H_