Support touch scroll gestures in menus.

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_
 #pragma once
 
 #include "build/build_config.h"
 
@@ skipping 86 matching lines @@
   // NOTE: the coordinates of the events are in that of the
   // MenuScrollViewContainer.
   void OnMousePressed(SubmenuView* source, const MouseEvent& event);
   void OnMouseDragged(SubmenuView* source, const MouseEvent& event);
   void OnMouseReleased(SubmenuView* source, const MouseEvent& event);
   void OnMouseMoved(SubmenuView* source, const MouseEvent& event);
   void OnMouseEntered(SubmenuView* source, const MouseEvent& event);
 #if defined(OS_LINUX)
   bool OnMouseWheel(SubmenuView* source, const MouseWheelEvent& event);
 #endif
+  ui::GestureStatus OnGestureEvent(SubmenuView* source,
+                                   const GestureEvent& event);
 
   bool GetDropFormats(
       SubmenuView* source,
       int* formats,
       std::set<OSExchangeData::CustomFormat>* custom_formats);
   bool AreDropTypesRequired(SubmenuView* source);
   bool CanDrop(SubmenuView* source, const OSExchangeData& data);
   void OnDragEntered(SubmenuView* source, const DropTargetEvent& event);
   int OnDragUpdated(SubmenuView* source, const DropTargetEvent& event);
   void OnDragExited(SubmenuView* source);
@@ skipping 391 matching lines @@
   View* active_mouse_view_;
 
   internal::MenuControllerDelegate* delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(MenuController);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_MENU_MENU_CONTROLLER_H_