Support touch scroll gestures in menus.

ui/views/controls/menu/menu_controller.cc

 // 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.
 
 #include "ui/views/controls/menu/menu_controller.h"
 
 #include "base/i18n/case_conversion.h"
 #include "base/i18n/rtl.h"
 #include "base/time.h"
 #include "base/utf_string_conversions.h"
@@ skipping 603 matching lines @@
   // MouseEntered is always followed by a mouse moved, so don't need to
   // do anything here.
 }
 
 #if defined(OS_LINUX)
 bool MenuController::OnMouseWheel(SubmenuView* source,
                                   const MouseWheelEvent& event) {
   MenuPart part = GetMenuPart(source, event.location());
   return part.submenu && part.submenu->OnMouseWheel(event);
 }
+
+ui::GestureStatus MenuController::OnGestureEvent(SubmenuView* source,
+                                    const GestureEvent& event) {
+  MenuPart part = GetMenuPart(source, event.location());
+  if (!part.submenu)
+    return ui::GESTURE_STATUS_UNKNOWN;
+  return part.submenu->OnGestureEvent(event);
+}
 #endif
 
 bool MenuController::GetDropFormats(
       SubmenuView* source,
       int* formats,
       std::set<OSExchangeData::CustomFormat>* custom_formats) {
   return source->GetMenuItem()->GetDelegate()->GetDropFormats(
       source->GetMenuItem(), formats, custom_formats);
 }
 
@@ skipping 1354 matching lines @@
   // is necessary to exit from nested loop (See Dispatch methods).
   // Send non-op event so that Dispatch method will always be called.
   // crbug.com/104684.
   if (exit_type_ == EXIT_ALL || exit_type_ == EXIT_DESTROYED)
     aura::RootWindow::GetInstance()->PostNativeEvent(ui::CreateNoopEvent());
 #endif
 }
 
 
 }  // namespace views