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diff --git a/chromium/ash/wm/overview/window_overview.h b/chromium/ash/wm/overview/window_overview.h
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+++ b/chromium/ash/wm/overview/window_overview.h
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+// Copyright 2013 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_OVERVIEW_WINDOW_OVERVIEW_H_
+#define ASH_WM_OVERVIEW_WINDOW_OVERVIEW_H_
+
+#include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/scoped_vector.h"
+#include "base/time/time.h"
+#include "ui/aura/window_tracker.h"
+#include "ui/events/event_handler.h"
+#include "ui/gfx/rect.h"
+
+namespace aura {
+class Window;
+namespace client {
+class CursorClient;
+}
+}  // namespace aura
+
+namespace ui {
+class LocatedEvent;
+}
+
+namespace views {
+class Widget;
+}
+
+namespace ash {
+
+class WindowSelector;
+class WindowSelectorItem;
+
+// The WindowOverview shows a grid of all of your windows and allows selecting
+// a window by clicking or tapping on it. It also displays a selection widget
+// used to indicate the current selection when alt-tabbing between windows.
+class WindowOverview : public ui::EventHandler {
+ public:
+  typedef ScopedVector<WindowSelectorItem> WindowSelectorItemList;
+
+  // Enters an overview mode displaying |windows| and dispatches methods
+  // on |window_selector| when a window is selected or selection is canceled.
+  // If |single_root_window| is not NULL, all windows will be positioned on the
+  // given root window.
+  WindowOverview(WindowSelector* window_selector,
+                 WindowSelectorItemList* windows,
+                 aura::Window* single_root_window);
+  virtual ~WindowOverview();
+
+  // Sets the selected window to be the window in position |index|.
+  void SetSelection(size_t index);
+
+  // Dispatched when the list of windows has changed.
+  void OnWindowsChanged();
+
+  // Moves the overview to only |root_window|.
+  void MoveToSingleRootWindow(aura::Window* root_window);
+
+  // ui::EventHandler:
+  virtual void OnKeyEvent(ui::KeyEvent* event) OVERRIDE;
+  virtual void OnMouseEvent(ui::MouseEvent* event) OVERRIDE;
+  virtual void OnScrollEvent(ui::ScrollEvent* event) OVERRIDE;
+  virtual void OnTouchEvent(ui::TouchEvent* event) OVERRIDE;
+
+ private:
+  // Returns the target of |event| or NULL if the event is not targeted at
+  // any of the windows in the selector.
+  aura::Window* GetEventTarget(ui::LocatedEvent* event);
+
+  // Returns the top-level window selected by targeting |window| or NULL if
+  // no overview window was found for |window|.
+  aura::Window* GetTargetedWindow(aura::Window* window);
+
+  // Hide and track all hidden windows not in overview.
+  void HideAndTrackNonOverviewWindows();
+
+  // Position all of the windows based on the current selection mode.
+  void PositionWindows();
+  // Position all of the windows from |root_window| on |root_window|.
+  void PositionWindowsFromRoot(aura::Window* root_window);
+  // Position all of the |windows| to fit on the |root_window|.
+  void PositionWindowsOnRoot(aura::Window* root_window,
+                             const std::vector<WindowSelectorItem*>& windows);
+
+  // Creates the selection widget.
+  void InitializeSelectionWidget();
+
+  // Returns the bounds for the selection widget for the windows_ at |index|.
+  gfx::Rect GetSelectionBounds(size_t index);
+
+  // Weak pointer to the window selector which owns this class.
+  WindowSelector* window_selector_;
+
+  // A weak pointer to the collection of windows in the overview wrapped by a
+  // helper class which restores their state and helps transform them to other
+  // root windows.
+  WindowSelectorItemList* windows_;
+
+  // Widget indicating which window is currently selected.
+  scoped_ptr<views::Widget> selection_widget_;
+
+  // Index of the currently selected window. This is used to determine when the
+  // selection changes rows and use a different animation.
+  size_t selection_index_;
+
+  // If NULL, each root window displays an overview of the windows in that
+  // display. Otherwise, all windows are in a single overview on
+  // |single_root_window_|.
+  aura::Window* single_root_window_;
+
+  // The time when overview was started.
+  base::Time overview_start_time_;
+
+  // The cursor client used to lock the current cursor during overview.
+  aura::client::CursorClient* cursor_client_;
+
+  // Tracks windows which were hidden because they were not part of the
+  // overview.
+  aura::WindowTracker hidden_windows_;
+
+  DISALLOW_COPY_AND_ASSIGN(WindowOverview);
+};
+
+}  // namespace ash
+
+#endif  // ASH_WM_OVERVIEW_WINDOW_OVERVIEW_H_