Update voice interaction OOBE with new UX spec

chrome/browser/resources/chromeos/login/oobe_buttons.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.
 
 Polymer({
   is: 'oobe-text-button',
 
   properties: {
     disabled: {type: Boolean, value: false, reflectToAttribute: true},
 
     inverse: Boolean,
 
     border: Boolean,
 
+    android: {type: Boolean, value: false},
+
     /* Note that we are not using "aria-label" property here, because
      * we want to pass the label value but not actually declare it as an
      * ARIA property anywhere but the actual target element.
      */
     labelForAria: String,
   },
 
   focus: function() {
     this.$.textButton.focus();
   },
@@ skipping 55 matching lines @@
      * we want to pass the label value but not actually declare it as an
      * ARIA property anywhere but the actual target element.
      */
     labelForAria: String
   },
 
   focus: function() {
     this.$.button.focus();
   },
 });