MD Settings: About page, add an explicit 'aboutPageReady' signal.

chrome/test/data/webui/settings/about_page_tests.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.
 
 cr.define('settings_about_page', function() {
   /**
    * @constructor
    * @implements {settings.AboutPageBrowserProxy}
    * @extends {settings.TestBrowserProxy}
    */
   var TestAboutPageBrowserProxy = function() {
     settings.TestBrowserProxy.call(this, [
+      'pageReady',
       'refreshUpdateStatus',
       'openHelpPage',
       'openFeedbackDialog',
       'getCurrentChannel',
       'getVersionInfo',
     ]);
 
     /** @type {!VersionInfo} */
     this.versionInfo_ = {
       arcVersion: '',
       osFirmware: '',
       osVersion: '',
     };
   };
 
   TestAboutPageBrowserProxy.prototype = {
     __proto__: settings.TestBrowserProxy.prototype,
 
     /** @param {!VersionInfo} */
     setVersionInfo: function(versionInfo) {
       this.versionInfo_ = versionInfo;
     },
 
     /** @override */
+    pageReady: function() {
+      this.methodCalled('pageReady');
+    },
+
+    /** @override */
     refreshUpdateStatus: function() {
       this.methodCalled('refreshUpdateStatus');
     },
 
     /** @override */
     getCurrentChannel: function() {
       this.methodCalled('getCurrentChannel');
       return Promise.resolve(BrowserChannel.BETA);
     },
 
@@ skipping 75 matching lines @@
             arcVersion: 'dummyArcVersion',
             osFirmware: 'dummyOsFirmware',
             osVersion: 'dummyOsVersion',
           };
           browserProxy.setVersionInfo(versionInfo);
 
           page = document.createElement('settings-detailed-build-info');
           document.body.appendChild(page);
 
           return Promise.all([
-            browserProxy.whenCalled('refreshUpdateStatus'),
+            browserProxy.whenCalled('pageReady'),
             browserProxy.whenCalled('getVersionInfo'),
             browserProxy.whenCalled('getCurrentChannel'),
           ]).then(function() {
             assertEquals(versionInfo.arcVersion, page.$.arcVersion.textContent);
             assertEquals(versionInfo.osVersion, page.$.osVersion.textContent);
             assertEquals(versionInfo.osFirmware, page.$.osFirmware.textContent);
           });
         });
       });
     }
   }
 
   return {
     registerTests: function() {
       if (cr.isChromeOS) {
         registerDetailedBuildInfoTests();
       }
       registerAboutPageTests();
     },
     registerOfficialBuildTests: registerOfficialBuildTests,
   };
 });