Minor refactoring of window resize code. I wasn't too happy with

ash/wm/workspace/workspace_window_resizer.h

 // 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_
 #pragma once
 
 #include "ash/wm/window_resizer.h"
 #include "base/compiler_specific.h"
 
 namespace ash {
 namespace internal {
 
+class RootWindowEventFilter;
+
 // 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:
-  WorkspaceWindowResizer(aura::Window* window,
-                         const gfx::Point& location,
-                         int window_component,
-                         int grid_size);
   virtual ~WorkspaceWindowResizer();
 
- protected:
-  // WindowResizer overrides:
-  virtual gfx::Rect GetBoundsForDrag(const gfx::Point& location) OVERRIDE;
-  virtual gfx::Rect GetFinalBounds() OVERRIDE;
+  // Creates a new WorkspaceWindowResizer. The caller takes ownership of the
+  // returned object. Returns NULL if not resizable.
+  static WorkspaceWindowResizer* Create(
+      aura::Window* window,
+      const gfx::Point& location,
+      int window_component,
+      int grid_size);
+
+  // Returns true if the drag will result in changing the window in anyway.
+  bool is_resizable() const { return details_.is_resizable; }
+
+  const gfx::Point& initial_location_in_parent() const {
+    return details_.initial_location_in_parent;
+  }
+
+  // Overridden from WindowResizer:
+  virtual void Drag(const gfx::Point& location);
+  virtual void CompleteDrag();
+  virtual void RevertDrag();
 
  private:
-  // Used to maintain the height of the window before we started collapsing it.
-  static void SetHeightBeforeObscured(aura::Window* window, int height);
-  static void ClearHeightBeforeObscured(aura::Window* window);
-  static int GetHeightBeforeObscured(aura::Window* window);
+  explicit WorkspaceWindowResizer(const Details& details);
 
   // Adjusts the bounds to enforce that windows are vertically contained in the
   // work area.
-  void AdjustBounds(gfx::Rect* bounds) const;
+  void AdjustBoundsForMainWindow(gfx::Rect* bounds) const;
+  void AdjustBoundsForWindow(const gfx::Rect& work_area,
+                             aura::Window* window,
+                             gfx::Rect* bounds) const;
+
+  // Clears the cached height of the window being dragged.
+  void ClearCachedHeights();
 
   // Returns true if the window touches the bottom of the work area.
-  bool WindowTouchesBottomOfScreen() const;
+  bool TouchesBottomOfScreen() const;
+
+  aura::Window* window() const { return details_.window; }
+
+  const Details details_;
 
   // True if the window size (height) should be constrained.
   const bool constrain_size_;
 
+  // Set to true once Drag() is invoked and the bounds of the window change.
+  bool did_move_or_resize_;
+
+  internal::RootWindowEventFilter* root_filter_;
+
   DISALLOW_COPY_AND_ASSIGN(WorkspaceWindowResizer);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_WM_WORKSPACE_WINDOW_RESIZER_H_