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diff --git a/chromium/ash/wm/window_resizer.h b/chromium/ash/wm/window_resizer.h
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+++ b/chromium/ash/wm/window_resizer.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_WINDOW_RESIZER_H_
+#define ASH_WM_WINDOW_RESIZER_H_
+
+#include "ash/ash_export.h"
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "ui/aura/client/window_move_client.h"
+#include "ui/gfx/rect.h"
+
+namespace aura {
+class Window;
+}
+
+namespace ash {
+namespace wm {
+class WindowState;
+}
+
+// WindowResizer is used by ToplevelWindowEventFilter to handle dragging, moving
+// or resizing a window. All coordinates passed to this are in the parent
+// windows coordinates.
+class ASH_EXPORT WindowResizer {
+ public:
+  // Constants to identify the type of resize.
+  static const int kBoundsChange_None;
+  static const int kBoundsChange_Repositions;
+  static const int kBoundsChange_Resizes;
+
+  // Used to indicate which direction the resize occurs in.
+  static const int kBoundsChangeDirection_None;
+  static const int kBoundsChangeDirection_Horizontal;
+  static const int kBoundsChangeDirection_Vertical;
+
+  WindowResizer();
+  virtual ~WindowResizer();
+
+  // Returns a bitmask of the kBoundsChange_ values.
+  static int GetBoundsChangeForWindowComponent(int component);
+
+  // Invoked to drag/move/resize the window. |location| is in the coordinates
+  // of the window supplied to the constructor. |event_flags| is the event
+  // flags from the event.
+  virtual void Drag(const gfx::Point& location, int event_flags) = 0;
+
+  // Invoked to complete the drag.
+  virtual void CompleteDrag(int event_flags) = 0;
+
+  // Reverts the drag.
+  virtual void RevertDrag() = 0;
+
+  // Returns the target window the resizer was created for.
+  virtual aura::Window* GetTarget() = 0;
+
+  // See comment for |Details::initial_location_in_parent|.
+  virtual const gfx::Point& GetInitialLocation() const = 0;
+
+ protected:
+  struct Details {
+    Details();
+    Details(aura::Window* window,
+            const gfx::Point& location,
+            int window_component,
+            aura::client::WindowMoveSource source);
+    ~Details();
+
+    // The window we're resizing.
+    // TODO(oshima): replace this with accessor method to
+    // |window_state->window()|.
+    aura::Window* window;
+
+    // The ash window state for the |window| above.
+    wm::WindowState* window_state;
+
+    // Initial bounds of the window in parent coordinates.
+    gfx::Rect initial_bounds_in_parent;
+
+    // Restore bounds (in screen coordinates) of the window before the drag
+    // started. Only set if the window is normal and is being dragged.
+    gfx::Rect restore_bounds;
+
+    // Location passed to the constructor, in |window->parent()|'s coordinates.
+    gfx::Point initial_location_in_parent;
+
+    // Initial opacity of the window.
+    float initial_opacity;
+
+    // The component the user pressed on.
+    int window_component;
+
+    // Bitmask of the |kBoundsChange_| constants.
+    int bounds_change;
+
+    // Bitmask of the |kBoundsChangeDirection_| constants.
+    int position_change_direction;
+
+    // Bitmask of the |kBoundsChangeDirection_| constants.
+    int size_change_direction;
+
+    // Will the drag actually modify the window?
+    bool is_resizable;
+
+    // Source of the event initiating the drag.
+    aura::client::WindowMoveSource source;
+  };
+
+  static gfx::Rect CalculateBoundsForDrag(const Details& details,
+                                          const gfx::Point& location);
+
+  static gfx::Rect AdjustBoundsToGrid(const gfx::Rect& bounds,
+                                      int grid_size);
+
+  static bool IsBottomEdge(int component);
+
+ private:
+  // In case of touch resizing, adjusts deltas so that the border is positioned
+  // just under the touch point.
+  static void AdjustDeltaForTouchResize(const Details& details,
+                                        int* delta_x,
+                                        int* delta_y);
+
+  // Returns the new origin of the window. The arguments are the difference
+  // between the current location and the initial location.
+  static gfx::Point GetOriginForDrag(const Details& details,
+                                     int delta_x,
+                                     int delta_y);
+
+  // Returns the size of the window for the drag.
+  static gfx::Size GetSizeForDrag(const Details& details,
+                                  int* delta_x,
+                                  int* delta_y);
+
+  // Returns the width of the window.
+  static int GetWidthForDrag(const Details& details,
+                             int min_width,
+                             int* delta_x);
+
+  // Returns the height of the drag.
+  static int GetHeightForDrag(const Details& details,
+                              int min_height,
+                              int* delta_y);
+};
+
+// Creates a WindowResizer for |window|. This can return a scoped_ptr
+// initialized with NULL if |window| should not be resized nor dragged.
+ASH_EXPORT scoped_ptr<WindowResizer> CreateWindowResizer(
+    aura::Window* window,
+    const gfx::Point& point_in_parent,
+    int window_component,
+    aura::client::WindowMoveSource source);
+
+}  // namespace ash
+
+#endif  // ASH_WM_WINDOW_RESIZER_H_