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diff --git a/chromium/ash/wm/workspace/workspace_window_resizer.h b/chromium/ash/wm/workspace/workspace_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_WORKSPACE_WINDOW_RESIZER_H_
+#define ASH_WM_WORKSPACE_WINDOW_RESIZER_H_
+
+#include <vector>
+
+#include "ash/wm/window_resizer.h"
+#include "ash/wm/workspace/magnetism_matcher.h"
+#include "base/compiler_specific.h"
+#include "base/gtest_prod_util.h"
+#include "base/memory/scoped_ptr.h"
+#include "ui/aura/window_tracker.h"
+
+namespace ash {
+namespace internal {
+
+class PhantomWindowController;
+class SnapSizer;
+class WindowSize;
+
+// WindowResizer implementation for workspaces. This enforces that windows are
+// not allowed to vertically move or resize outside of the work area. As windows
+// are moved outside the work area they are shrunk. We remember the height of
+// the window before it was moved so that if the window is again moved up we
+// attempt to restore the old height.
+class ASH_EXPORT WorkspaceWindowResizer : public WindowResizer {
+ public:
+  // When dragging an attached window this is the min size we'll make sure is
+  // visible. In the vertical direction we take the max of this and that from
+  // the delegate.
+  static const int kMinOnscreenSize;
+
+  // Min height we'll force on screen when dragging the caption.
+  // TODO: this should come from a property on the window.
+  static const int kMinOnscreenHeight;
+
+  // Snap region when dragging close to the edges. That is, as the window gets
+  // this close to an edge of the screen it snaps to the edge.
+  static const int kScreenEdgeInset;
+
+  // Distance in pixels that the cursor must move past an edge for a window
+  // to move or resize beyond that edge.
+  static const int kStickyDistancePixels;
+
+  virtual ~WorkspaceWindowResizer();
+
+  static WorkspaceWindowResizer* Create(
+      aura::Window* window,
+      const gfx::Point& location_in_parent,
+      int window_component,
+      aura::client::WindowMoveSource source,
+      const std::vector<aura::Window*>& attached_windows);
+
+  // WindowResizer:
+  virtual void Drag(const gfx::Point& location_in_parent,
+                    int event_flags) OVERRIDE;
+  virtual void CompleteDrag(int event_flags) OVERRIDE;
+  virtual void RevertDrag() OVERRIDE;
+  virtual aura::Window* GetTarget() OVERRIDE;
+  virtual const gfx::Point& GetInitialLocation() const OVERRIDE;
+
+ private:
+  WorkspaceWindowResizer(const Details& details,
+                         const std::vector<aura::Window*>& attached_windows);
+
+ private:
+  FRIEND_TEST_ALL_PREFIXES(WorkspaceWindowResizerTest, CancelSnapPhantom);
+  FRIEND_TEST_ALL_PREFIXES(WorkspaceWindowResizerTest, PhantomSnapMaxSize);
+  FRIEND_TEST_ALL_PREFIXES(WorkspaceWindowResizerTest, PhantomWindowShow);
+
+  // Type of snapping.
+  enum SnapType {
+    // Snap to the left/right edge of the screen.
+    SNAP_LEFT_EDGE,
+    SNAP_RIGHT_EDGE,
+
+    // No snap position.
+    SNAP_NONE
+  };
+
+  // Returns the final bounds to place the window at. This differs from
+  // the current when snapping.
+  gfx::Rect GetFinalBounds(const gfx::Rect& bounds) const;
+
+  // Lays out the attached windows. |bounds| is the bounds of the main window.
+  void LayoutAttachedWindows(gfx::Rect* bounds);
+
+  // Calculates the new sizes of the attached windows, given that the main
+  // window has been resized (along the primary axis) by |delta|.
+  // |available_size| is the maximum length of the space that the attached
+  // windows are allowed to occupy (ie: the distance between the right/bottom
+  // edge of the primary window and the right/bottom of the desktop area).
+  // Populates |sizes| with the desired sizes of the attached windows, and
+  // returns the number of pixels that couldn't be allocated to the attached
+  // windows (due to min/max size constraints).
+  // Note the return value can be positive or negative, a negative value
+  // indicating that that many pixels couldn't be removed from the attached
+  // windows.
+  int CalculateAttachedSizes(
+      int delta,
+      int available_size,
+      std::vector<int>* sizes) const;
+
+  // Divides |amount| evenly between |sizes|. If |amount| is negative it
+  // indicates how many pixels |sizes| should be shrunk by.
+  // Returns how many pixels failed to be allocated/removed from |sizes|.
+  int GrowFairly(int amount, std::vector<WindowSize>& sizes) const;
+
+  // Calculate the ratio of pixels that each WindowSize in |sizes| should
+  // receive when growing or shrinking.
+  void CalculateGrowthRatios(const std::vector<WindowSize*>& sizes,
+                             std::vector<float>* out_ratios) const;
+
+  // Adds a WindowSize to |sizes| for each attached window.
+  void CreateBucketsForAttached(std::vector<WindowSize>* sizes) const;
+
+  // If possible snaps the window to a neary window. Updates |bounds| if there
+  // was a close enough window.
+  void MagneticallySnapToOtherWindows(gfx::Rect* bounds);
+
+  // If possible snaps the resize to a neary window. Updates |bounds| if there
+  // was a close enough window.
+  void MagneticallySnapResizeToOtherWindows(gfx::Rect* bounds);
+
+  // Finds the neareset window to magentically snap to. Updates
+  // |magnetism_window_| and |magnetism_edge_| appropriately. |edges| is a
+  // bitmask of the MagnetismEdges to match again. Returns true if a match is
+  // found.
+  bool UpdateMagnetismWindow(const gfx::Rect& bounds, uint32 edges);
+
+  // Adjusts the bounds of the window: magnetically snapping, ensuring the
+  // window has enough on screen... |snap_size| is the distance from an edge of
+  // the work area before the window is snapped. A value of 0 results in no
+  // snapping.
+  void AdjustBoundsForMainWindow(int snap_size, gfx::Rect* bounds);
+
+  // Stick the window bounds to the work area during a move.
+  bool StickToWorkAreaOnMove(const gfx::Rect& work_area,
+                             int sticky_size,
+                             gfx::Rect* bounds) const;
+
+  // Stick the window bounds to the work area during a resize.
+  void StickToWorkAreaOnResize(const gfx::Rect& work_area,
+                               int sticky_size,
+                               gfx::Rect* bounds) const;
+
+  // Returns a coordinate along the primary axis. Used to share code for
+  // left/right multi window resize and top/bottom resize.
+  int PrimaryAxisSize(const gfx::Size& size) const;
+  int PrimaryAxisCoordinate(int x, int y) const;
+
+  // Updates the bounds of the phantom window for window snapping.
+  void UpdateSnapPhantomWindow(const gfx::Point& location,
+                               const gfx::Rect& bounds);
+
+  // Restacks the windows z-order position so that one of the windows is at the
+  // top of the z-order, and the rest directly underneath it.
+  void RestackWindows();
+
+  // Returns the SnapType for the specified point. SNAP_NONE is used if no
+  // snapping should be used.
+  SnapType GetSnapType(const gfx::Point& location) const;
+
+  aura::Window* window() const { return details_.window; }
+
+  const Details details_;
+
+  const std::vector<aura::Window*> attached_windows_;
+
+  // Set to true once Drag() is invoked and the bounds of the window change.
+  bool did_move_or_resize_;
+
+  // The initial size of each of the windows in |attached_windows_| along the
+  // primary axis.
+  std::vector<int> initial_size_;
+
+  // Sum of the minimum sizes of the attached windows.
+  int total_min_;
+
+  // Sum of the sizes in |initial_size_|.
+  int total_initial_size_;
+
+  // Gives a previews of where the the window will end up. Only used if there
+  // is a grid and the caption is being dragged.
+  scoped_ptr<PhantomWindowController> snap_phantom_window_controller_;
+
+  // Used to determine the target position of a snap.
+  scoped_ptr<SnapSizer> snap_sizer_;
+
+  // Last SnapType.
+  SnapType snap_type_;
+
+  // Number of mouse moves since the last bounds change. Only used for phantom
+  // placement to track when the mouse is moved while pushed against the edge of
+  // the screen.
+  int num_mouse_moves_since_bounds_change_;
+
+  // The mouse location passed to Drag().
+  gfx::Point last_mouse_location_;
+
+  // Window the drag has magnetically attached to.
+  aura::Window* magnetism_window_;
+
+  // Used to verify |magnetism_window_| is still valid.
+  aura::WindowTracker window_tracker_;
+
+  // If |magnetism_window_| is non-NULL this indicates how the two windows
+  // should attach.
+  MatchedEdge magnetism_edge_;
+
+  DISALLOW_COPY_AND_ASSIGN(WorkspaceWindowResizer);
+};
+
+}  // namespace internal
+}  // namespace ash
+
+#endif  // ASH_WM_WORKSPACE_WINDOW_RESIZER_H_