Implement the new wallpaper manager launcher window.

chrome/browser/resources/chromeos/wallpaper_manager/js/main.js

+// 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.
+
+function init() {
+  window.addEventListener('load',
+      windowStateManager.saveStates.bind(windowStateManager));
+  window.addEventListener('focus',
+      windowStateManager.saveStates.bind(windowStateManager));
+  window.addEventListener('unload',
+      windowStateManager.restoreStates.bind(windowStateManager));
+}
+
+document.addEventListener('DOMContentLoaded', init);