Adds WmWindow and converts WindowState to use it

ash/wm/window_util.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_WINDOW_UTIL_H_
 #define ASH_WM_WINDOW_UTIL_H_
 
 #include "ash/ash_export.h"
 #include "base/compiler_specific.h"
 #include "ui/base/ui_base_types.h"
@@ skipping 11 matching lines @@
 namespace ui {
 class Event;
 }
 
 namespace ash {
 // We force at least this many DIPs for any window on the screen.
 const int kMinimumOnScreenArea = 25;
 
 namespace wm {
 
+class WmWindow;
+
 // Utility functions for window activation.
 ASH_EXPORT void ActivateWindow(aura::Window* window);
 ASH_EXPORT void DeactivateWindow(aura::Window* window);
 ASH_EXPORT bool IsActiveWindow(aura::Window* window);
 ASH_EXPORT aura::Window* GetActiveWindow();
 ASH_EXPORT bool CanActivateWindow(aura::Window* window);
 
 // Retrieves the activatable window for |window|. If |window| is activatable,
 // this will just return it, otherwise it will climb the parent/transient parent
 // chain looking for a window that is activatable, per the ActivationController.
 // If you're looking for a function to get the activatable "top level" window,
 // this is probably what you're looking for.
 ASH_EXPORT aura::Window* GetActivatableWindow(aura::Window* window);
 
 // TODO(oshima): remove this.
 ASH_EXPORT bool IsWindowMinimized(aura::Window* window);
 
 // Returns true if |window|'s location can be controlled by the user.
 ASH_EXPORT bool IsWindowUserPositionable(aura::Window* window);
 
 // Moves the window to the center of the display.
 ASH_EXPORT void CenterWindow(aura::Window* window);
 
+ASH_EXPORT gfx::Rect GetDefaultLeftSnappedWindowBoundsInParent(
+    wm::WmWindow* window);
+ASH_EXPORT gfx::Rect GetDefaultRightSnappedWindowBoundsInParent(
+    wm::WmWindow* window);
+
 // Returns the bounds of a left snapped window with default width in parent
 // coordinates.
 ASH_EXPORT gfx::Rect GetDefaultLeftSnappedWindowBoundsInParent(
     aura::Window* window);
 
 // Returns the bounds of a right snapped window with default width in parent
 // coordinates.
 ASH_EXPORT gfx::Rect GetDefaultRightSnappedWindowBoundsInParent(
     aura::Window* window);
 
@@ skipping 43 matching lines @@
 ASH_EXPORT void SetSnapsChildrenToPhysicalPixelBoundary(
     aura::Window* container);
 
 // Traverse the |container| tree and installs SnapToPixelLayoutManager.
 void InstallSnapLayoutManagerToContainers(aura::Window* container);
 
 }  // namespace wm
 }  // namespace ash
 
 #endif  // ASH_WM_WINDOW_UTIL_H_