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diff --git a/chromium/ash/wm/root_window_layout_manager.h b/chromium/ash/wm/root_window_layout_manager.h
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+// 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 ASH_WM_ROOT_WINDOW_LAYOUT_MANAGER_H_
+#define ASH_WM_ROOT_WINDOW_LAYOUT_MANAGER_H_
+
+#include "ash/shell_window_ids.h"
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
+#include "ui/aura/layout_manager.h"
+
+namespace aura {
+class Window;
+}
+namespace gfx {
+class Rect;
+}
+namespace ui {
+class Layer;
+}
+namespace views {
+class Widget;
+}
+
+namespace ash {
+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();
+
+ // Overridden from aura::LayoutManager:
+ virtual void OnWindowResized() OVERRIDE;
+ virtual void OnWindowAddedToLayout(aura::Window* child) OVERRIDE;
+ virtual void OnWillRemoveWindowFromLayout(aura::Window* child) OVERRIDE;
+ virtual void OnWindowRemovedFromLayout(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_;
+
+ DISALLOW_COPY_AND_ASSIGN(RootWindowLayoutManager);
+};
+
+} // namespace internal
+} // namespace ash
+
+#endif // ASH_WM_ROOT_WINDOW_LAYOUT_MANAGER_H_