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diff --git a/chromium/ash/wm/base_layout_manager.h b/chromium/ash/wm/base_layout_manager.h
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+++ b/chromium/ash/wm/base_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_BASE_LAYOUT_MANAGER_H_
+#define ASH_WM_BASE_LAYOUT_MANAGER_H_
+
+#include <set>
+
+#include "ash/ash_export.h"
+#include "ash/shell_observer.h"
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "ui/aura/client/activation_change_observer.h"
+#include "ui/aura/layout_manager.h"
+#include "ui/aura/window_observer.h"
+#include "ui/base/events/event_handler.h"
+#include "ui/base/ui_base_types.h"
+
+namespace aura {
+class RootWindow;
+class Window;
+}
+
+namespace ash {
+namespace internal {
+
+// BaseLayoutManager is the simplest possible implementation for a window
+// layout manager. It listens for changes to kShowStateKey and resizes the
+// window appropriately.  Subclasses should be sure to invoke the base class
+// for adding and removing windows, otherwise show state will not be tracked
+// properly.
+class ASH_EXPORT BaseLayoutManager
+    : public aura::LayoutManager,
+      public ash::ShellObserver,
+      public aura::WindowObserver,
+      public aura::client::ActivationChangeObserver {
+ public:
+  typedef std::set<aura::Window*> WindowSet;
+
+  explicit BaseLayoutManager(aura::RootWindow* root_window);
+  virtual ~BaseLayoutManager();
+
+  const WindowSet& windows() const { return windows_; }
+
+  // Given a |window| and tentative |restore_bounds|, returns new bounds that
+  // ensure that at least a few pixels of the screen background are visible
+  // outside the edges of the window.
+  static gfx::Rect BoundsWithScreenEdgeVisible(aura::Window* window,
+                                               const gfx::Rect& restore_bounds);
+
+  // LayoutManager overrides:
+  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;
+
+  // ash::ShellObserver overrides:
+  virtual void OnDisplayWorkAreaInsetsChanged() OVERRIDE;
+
+  // WindowObserver overrides:
+  virtual void OnWindowPropertyChanged(aura::Window* window,
+                                       const void* key,
+                                       intptr_t old) OVERRIDE;
+  virtual void OnWindowDestroying(aura::Window* window) OVERRIDE;
+  virtual void OnWindowBoundsChanged(aura::Window* window,
+                                     const gfx::Rect& old_bounds,
+                                     const gfx::Rect& new_bounds) OVERRIDE;
+
+  // aura::client::ActivationChangeObserver overrides:
+  virtual void OnWindowActivated(aura::Window* gained_active,
+                                 aura::Window* lost_active) OVERRIDE;
+
+ protected:
+  enum AdjustWindowReason {
+    ADJUST_WINDOW_DISPLAY_SIZE_CHANGED,
+    ADJUST_WINDOW_WORK_AREA_INSETS_CHANGED,
+  };
+
+  // Invoked from OnWindowPropertyChanged() if |kShowStateKey| changes.
+  virtual void ShowStateChanged(aura::Window* window,
+                                ui::WindowShowState last_show_state);
+
+  // Adjusts the window's bounds when the display area changes for given
+  // window. This happens when the display size, work area insets or
+  // the display on which the window exists has changed.
+  // If this is called for a display size change (i.e. |reason|
+  // is ADJUST_WINDOW_DISPLAY_SIZE_CHANGED), the non-maximized/non-fullscreen
+  // windows are readjusted to make sure the window is completely within the
+  // display region. Otherwise, it makes sure at least some parts of the window
+  // is on display.
+  virtual void AdjustAllWindowsBoundsForWorkAreaChange(
+      AdjustWindowReason reason);
+
+  // Adjusts the sizes of the specific window in respond to a screen change or
+  // display-area size change.
+  virtual void AdjustWindowBoundsForWorkAreaChange(aura::Window* window,
+                                                   AdjustWindowReason reason);
+
+  aura::RootWindow* root_window() { return root_window_; }
+
+ private:
+  // Update window bounds based on a change in show state.
+  void UpdateBoundsFromShowState(aura::Window* window);
+
+  // Set of windows we're listening to.
+  WindowSet windows_;
+
+  aura::RootWindow* root_window_;
+
+  DISALLOW_COPY_AND_ASSIGN(BaseLayoutManager);
+};
+
+}  // namespace internal
+}  // namespace ash
+
+#endif  // ASH_WM_BASE_LAYOUT_MANAGER_H_