MD Settings: Introduce CrScrollableBehavior

chrome/browser/resources/settings/on_startup_page/startup_urls_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-startup-urls-page' is the settings page
  * containing the urls that will be opened when chrome is started.
  */
 
 Polymer({
   is: 'settings-startup-urls-page',
 
-  behaviors: [WebUIListenerBehavior],
+  behaviors: [CrScrollableBehavior, WebUIListenerBehavior],
 
   properties: {
     /** @type {settings.StartupUrlsPageBrowserProxy} */
     browserProxy_: Object,
 
     /**
      * Pages to load upon browser startup.
      * @private {!Array<!StartupPageInfo>}
      */
     startupPages_: Array,
 
     /** @private */
     showStartupUrlDialog_: Boolean,
 
     /** @private {?StartupPageInfo} */
     startupUrlDialogModel_: Object,
   },
 
   /** @override */
   attached: function() {
     this.browserProxy_ = settings.StartupUrlsPageBrowserProxyImpl.getInstance();
     this.addWebUIListener('update-startup-pages', function(startupPages) {
       this.startupPages_ = startupPages;
+      this.updateScrollableContents();
     }.bind(this));
     this.browserProxy_.loadStartupPages();
 
     this.addEventListener(settings.EDIT_STARTUP_URL_EVENT, function(event) {
       this.startupUrlDialogModel_ = event.detail;
       this.openDialog_();
       event.stopPropagation();
     }.bind(this));
   },
 
@@ skipping 17 matching lines @@
         this.startupUrlDialogModel_ = null;
       }.bind(this));
     }.bind(this));
   },
 
   /** @private */
   onUseCurrentPagesTap_: function() {
     this.browserProxy_.useCurrentPages();
   },
 });