Adds WmWindow and converts WindowState to use it

ash/shell/toplevel_window.cc

 // 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.
 
 #include "ash/shell/toplevel_window.h"
 
 #include "ash/shell.h"
 #include "ash/wm/window_positioner.h"
 #include "ash/wm/window_state.h"
+#include "ash/wm/window_state_aura.h"
 #include "base/strings/utf_string_conversions.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_event_dispatcher.h"
 #include "ui/gfx/canvas.h"
 #include "ui/views/widget/widget.h"
 
 namespace ash {
 namespace shell {
 namespace {
 
@@ skipping 80 matching lines @@
 bool ToplevelWindow::CanMaximize() const {
   return params_.can_maximize;
 }
 
 bool ToplevelWindow::CanMinimize() const {
   return params_.can_maximize;
 }
 
 }  // namespace shell
 }  // namespace ash