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

chrome/test/data/webui/settings/about_page_tests.js

Index: chrome/test/data/webui/settings/about_page_tests.js
diff --git a/chrome/test/data/webui/settings/about_page_tests.js b/chrome/test/data/webui/settings/about_page_tests.js
index f70c60c538724e3141dc76cf5ff7be94ad445a20..6a0b7bb2da1af4f37a03c4255ff124cffd3849de 100644
--- a/chrome/test/data/webui/settings/about_page_tests.js
+++ b/chrome/test/data/webui/settings/about_page_tests.js
@@ -10,6 +10,7 @@ cr.define('settings_about_page', function() {
    */
   var TestAboutPageBrowserProxy = function() {
     settings.TestBrowserProxy.call(this, [
+      'pageReady',
       'refreshUpdateStatus',
       'openHelpPage',
       'openFeedbackDialog',
@@ -34,6 +35,11 @@ cr.define('settings_about_page', function() {
     },
 
     /** @override */
+    pageReady: function() {
+      this.methodCalled('pageReady');
+    },
+
+    /** @override */
     refreshUpdateStatus: function() {
       this.methodCalled('refreshUpdateStatus');
     },
@@ -129,7 +135,7 @@ cr.define('settings_about_page', function() {
           document.body.appendChild(page);
 
           return Promise.all([
-            browserProxy.whenCalled('refreshUpdateStatus'),
+            browserProxy.whenCalled('pageReady'),
             browserProxy.whenCalled('getVersionInfo'),
             browserProxy.whenCalled('getCurrentChannel'),
           ]).then(function() {