[MD settings] specify @override on created, ready, and attached

chrome/browser/resources/settings/device_page/stylus.js

 // Copyright 2016 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.
 
 /**
  * @fileoverview
  * 'settings-stylus' is the settings subpage with stylus-specific settings.
  */
 
 /** @const */ var FIND_MORE_APPS_URL = 'https://play.google.com/store/apps/' +
     'collection/promotion_30023cb_stylus_apps';
 
 Polymer({
   is: 'settings-stylus',
 
   properties: {
     /** Preferences state. */
     prefs: {
       type: Object,
       notify: true,
     },
 
     /**
      * Note taking apps the user can pick between.
      * @type {Array<{name:string, value:string, preferred:boolean}>}
      * @private
      */
     appChoices_: {
       type: Array,
-      value: function() { return []; }
+      value: function() {
+        return [];
+      }
     },
 
     /**
      * True if the ARC container has not finished starting yet.
      * @private
      */
-    waitingForAndroid_: {
-      type: Boolean,
-      value: false
-    },
+    waitingForAndroid_: {type: Boolean, value: false},
   },
 
 
   /** @private {?settings.DevicePageBrowserProxy} */
   browserProxy_: null,
 
+  /** @override */
   created: function() {
     this.browserProxy_ = settings.DevicePageBrowserProxyImpl.getInstance();
   },
 
+  /** @override */
   ready: function() {
     this.browserProxy_.setNoteTakingAppsUpdatedCallback(
         this.onNoteAppsUpdated_.bind(this));
     this.browserProxy_.requestNoteTakingApps();
   },
 
   /** @private */
   onSelectedAppChanged_: function() {
     this.browserProxy_.setPreferredNoteTakingApp(this.$.menu.value);
   },
@@ skipping 24 matching lines @@
    */
   showApps_: function(apps, waitingForAndroid) {
     return apps.length > 0 && !waitingForAndroid;
   },
 
   /** @private */
   onFindAppsTap_: function() {
     this.browserProxy_.showPlayStore(FIND_MORE_APPS_URL);
   },
 });