Move some more files into ash... this time seed the window manager dir.

ui/aura_shell/stacking_controller.h

-// Copyright (c) 2011 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_AURA_SHELL_STACKING_CONTROLLER_H_
-#define UI_AURA_SHELL_STACKING_CONTROLLER_H_
-#pragma once
-
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-#include "base/memory/scoped_ptr.h"
-#include "ui/aura/client/stacking_client.h"
-
-namespace aura_shell {
-namespace internal {
-
-class AlwaysOnTopController;
-
-class StackingController : public aura::client::StackingClient {
- public:
-  StackingController();
-  virtual ~StackingController();
-
-  // Overridden from aura::client::StackingClient:
-  virtual aura::Window* GetDefaultParent(aura::Window* window) OVERRIDE;
-
- private:
-  // Returns corresponding modal container for a modal window.
-  // If screen lock is not active, all modal windows are placed into the
-  // normal modal container.
-  // Otherwise those that originate from LockScreen container and above are
-  // placed in the screen lock modal container.
-  aura::Window* GetModalContainer(aura::Window* window) const;
-
-  scoped_ptr<internal::AlwaysOnTopController> always_on_top_controller_;
-
-  DISALLOW_COPY_AND_ASSIGN(StackingController);
-};
-
-}  // namespace internal
-}  // namespace aura_shell
-
-#endif  // UI_AURA_SHELL_STACKING_CONTROLLER_H_