Support touch scroll gestures in menus.

ui/views/controls/menu/menu_host_root_view.h

Index: ui/views/controls/menu/menu_host_root_view.h
diff --git a/ui/views/controls/menu/menu_host_root_view.h b/ui/views/controls/menu/menu_host_root_view.h
index 15f61bb35dae06ddb1f636fa70acf3ec488ef068..1af721c2943d9722833b6d2100971e3d162b95f4 100644
--- a/ui/views/controls/menu/menu_host_root_view.h
+++ b/ui/views/controls/menu/menu_host_root_view.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -31,6 +31,7 @@ class MenuHostRootView : public internal::RootView {
   virtual void OnMouseReleased(const MouseEvent& event) OVERRIDE;
   virtual void OnMouseMoved(const MouseEvent& event) OVERRIDE;
   virtual bool OnMouseWheel(const MouseWheelEvent& event) OVERRIDE;
+  virtual ui::GestureStatus OnGestureEvent(const GestureEvent& event) OVERRIDE;
 
  private:
   // Returns the MenuController for this MenuHostRootView.