Adds code for a new Aura shell.

ui/aura/window.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_WINDOW_H_
 #define UI_AURA_WINDOW_H_
 #pragma once
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/aura/aura_export.h"
 #include "ui/gfx/compositor/layer_delegate.h"
 #include "ui/gfx/rect.h"
 
 class SkCanvas;
 
 namespace ui {
 class Compositor;
 class Layer;
 }
 
 namespace aura {
 
 class Desktop;
 class KeyEvent;
+class LayoutManager;
 class MouseEvent;
 class WindowDelegate;
 class WindowManager;
 
 namespace internal {
 class FocusManager;
 }
 
 // Aura window implementation. Interesting events are sent to the
 // WindowDelegate.
@@ skipping 20 matching lines @@
   int id() const { return id_; }
   void set_id(int id) { id_ = id; }
 
   ui::Layer* layer() { return layer_.get(); }
   const ui::Layer* layer() const { return layer_.get(); }
 
   // Changes the visibility of the window.
   void SetVisibility(Visibility visibility);
   Visibility visibility() const { return visibility_; }
 
+  void SetLayoutManager(LayoutManager* layout_manager);
+
   // Changes the bounds of the window.
   void SetBounds(const gfx::Rect& bounds, int anim_ms);
   const gfx::Rect& bounds() const { return bounds_; }
 
   // Marks the a portion of window as needing to be painted.
   void SchedulePaintInRect(const gfx::Rect& rect);
 
   // Sets the contents of the window.
   void SetCanvas(const SkCanvas& canvas, const gfx::Point& origin);
 
@@ skipping 70 matching lines @@
   // The Window's parent.
   // TODO(beng): Implement NULL-ness for toplevels.
   Window* parent_;
 
   // Child windows. Topmost is last.
   Windows children_;
 
   int id_;
 
   scoped_ptr<WindowManager> window_manager_;
+  scoped_ptr<LayoutManager> layout_manager_;
 
   void* user_data_;
 
   DISALLOW_COPY_AND_ASSIGN(Window);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_WINDOW_H_