Adds WmWindow and converts WindowState to use it

ash/wm/wm_event.h

 // Copyright 2014 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_WM_EVENT_H_
 #define ASH_WM_WM_EVENT_H_
 
 #include "ash/ash_export.h"
 #include "ash/wm/wm_types.h"
 #include "base/macros.h"
 #include "ui/gfx/geometry/rect.h"
 
+// TODO(sky): move to common.
 namespace ash {
 namespace wm {
 
 // WMEventType defines a set of operations that can change the
 // window's state type and bounds.
 enum WMEventType {
   // Following events are the request to become corresponding state.
   // Note that this does not mean the window will be in corresponding
   // state and the request may not be fullfilled.
 
@@ skipping 91 matching lines @@
   gfx::Rect requested_bounds_;
 
   DISALLOW_COPY_AND_ASSIGN(SetBoundsEvent);
 };
 
 }  // namespace wm
 }  // namespace ash
 
 #endif  // ASH_WM_WM_EVENT_H_