MD Settings: Lazy-load sub-pages.

chrome/browser/resources/settings/internet_page/internet_detail_page.js

 // Copyright 2015 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-internet-detail' is the settings subpage containing details
  * for a network.
  */
 (function() {
 'use strict';
 
 /** @const */ var CARRIER_VERIZON = 'Verizon Wireless';
 
 Polymer({
   is: 'settings-internet-detail-page',
 
   behaviors: [CrPolicyNetworkBehavior],
 
   properties: {
     /**
      * The network GUID to display details for.
      */
     guid: {
       type: String,
       value: '',
-      observer: 'guidChanged_',
     },
 
     /**
      * The current properties for the network matching |guid|.
      * @type {!CrOnc.NetworkProperties|undefined}
      */
     networkProperties: {
       type: Object,
       observer: 'networkPropertiesChanged_'
     },
@@ skipping 51 matching lines @@
 
     /**
      * Interface for networkingPrivate calls, passed from internet_page.
      * @type {NetworkingPrivate}
      */
     networkingPrivate: {
       type: Object,
     },
   },
 
+  observers: [
+    'guidChanged_(guid, networkingPrivate)',
+  ],
+
   /**
    * Listener function for chrome.networkingPrivate.onNetworksChanged event.
    * @type {function(!Array<string>)}
    * @private
    */
   networksChangedListener_: function() {},
 
   /** @override */
   attached: function() {
     this.networksChangedListener_ = this.onNetworksChangedEvent_.bind(this);
@@ skipping 589 matching lines @@
    */
   allPropertiesMatch_: function(curValue, newValue) {
     for (let key in newValue) {
       if (newValue[key] != curValue[key])
         return false;
     }
     return true;
   }
 });
 })();