Create OOBE screen for Waiting for Container ready

chrome/browser/resources/chromeos/login/oobe_screen_voice_interaction_value_prop.js

 // Copyright 2017 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 Oobe Voice Interaction Value Prop screen implementation.
  */
 
 login.createScreen(
     'VoiceInteractionValuePropScreen', 'voice-interaction-value-prop',
     function() {
       return {
 
+        /**
+         * Returns a control which should receive an initial focus.
+         */
+        get defaultControl() {
+          return $('voice-interaction-value-prop-md')
+              .getElement('continueButton');
+        },
+
         /** @Override */
         onBeforeShow: function(data) {
           var valueView = $('voice-interaction-value-prop-md')
                               .getElement('value-prop-view');
 
           valueView.addContentScripts([{
             name: 'stripLinks',
             matches: ['<all_urls>'],
             js: {
               code: 'document.querySelectorAll(\'a\').forEach(' +
@@ skipping 15 matching lines @@
           }, {urls: ['<all_urls>'], types: ['main_frame']});
 
           var locale = loadTimeData.getString('locale');
           valueView.src = 'https://www.gstatic.com/opa-chromeos/oobe/' +
               locale + '/value_proposition.html';
 
           Oobe.getInstance().headerHidden = true;
         }
       };
     });