Move some more WM functionality down into ash.

ui/aura_shell/root_window_layout_manager.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_ROOT_WINDOW_LAYOUT_MANAGER_H_
-#define UI_AURA_SHELL_ROOT_WINDOW_LAYOUT_MANAGER_H_
-#pragma once
-
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-#include "ui/aura/layout_manager.h"
-
-namespace aura {
-class Window;
-}
-namespace gfx {
-class Rect;
-}
-namespace views {
-class Widget;
-}
-
-namespace aura_shell {
-namespace internal {
-
-// A layout manager for the root window.
-// Resizes all of its immediate children to fill the bounds of the root window.
-class RootWindowLayoutManager : public aura::LayoutManager {
- public:
-  explicit RootWindowLayoutManager(aura::Window* owner);
-  virtual ~RootWindowLayoutManager();
-
-  void set_background_widget(views::Widget* background_widget) {
-    background_widget_ = background_widget;
-  }
-
-  // Overridden from aura::LayoutManager:
-  virtual void OnWindowResized() OVERRIDE;
-  virtual void OnWindowAddedToLayout(aura::Window* child) OVERRIDE;
-  virtual void OnWillRemoveWindowFromLayout(aura::Window* child) OVERRIDE;
-  virtual void OnChildWindowVisibilityChanged(aura::Window* child,
-                                              bool visible) OVERRIDE;
-  virtual void SetChildBounds(aura::Window* child,
-                              const gfx::Rect& requested_bounds) OVERRIDE;
-
- private:
-  aura::Window* owner_;
-
-  // May be NULL if we're not painting a background.
-  views::Widget* background_widget_;
-
-  DISALLOW_COPY_AND_ASSIGN(RootWindowLayoutManager);
-};
-
-}  // namespace internal
-}  // namespace aura_shell
-
-#endif  // UI_AURA_SHELL_ROOT_WINDOW_LAYOUT_MANAGER_H_