make menus, bubbles, etc. top level windows on aura

ui/views/widget/desktop_aura/desktop_native_widget_aura.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_WIDGET_DESKTOP_AURA_DESKTOP_NATIVE_WIDGET_AURA_H_
 #define UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_NATIVE_WIDGET_AURA_H_
 
 #include "base/memory/weak_ptr.h"
 #include "ui/aura/client/activation_change_observer.h"
 #include "ui/aura/client/activation_delegate.h"
@@ skipping 10 matching lines @@
 }
 }
 
 namespace views {
 
 namespace corewm {
 class CompoundEventFilter;
 class InputMethodEventFilter;
 class ShadowController;
 class TooltipController;
+class VisibilityController;
 }
 
 class DesktopRootWindowHost;
 class DropHelper;
 class NativeWidgetAuraWindowObserver;
 class TooltipManagerAura;
 
 // TODO(erg): May also need to be a DragDropDelegate
 class VIEWS_EXPORT DesktopNativeWidgetAura
     : public internal::NativeWidgetPrivate,
@@ skipping 180 matching lines @@
   corewm::CompoundEventFilter* root_window_event_filter_;
 
   scoped_ptr<corewm::InputMethodEventFilter> input_method_event_filter_;
 
   scoped_ptr<DropHelper> drop_helper_;
   int last_drop_operation_;
 
   scoped_ptr<corewm::TooltipController> tooltip_controller_;
   scoped_ptr<TooltipManagerAura> tooltip_manager_;
 
+  scoped_ptr<views::corewm::VisibilityController> visibility_controller_;
+
   // See comments in OnLostActive().
   bool restore_focus_on_activate_;
 
   scoped_ptr<corewm::ShadowController> shadow_controller_;
 
   DISALLOW_COPY_AND_ASSIGN(DesktopNativeWidgetAura);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_NATIVE_WIDGET_AURA_H_