ChromeOS: Implement Accessibility Options screen of material design OOBE.

chrome/browser/resources/chromeos/login/oobe_a11n_option.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-dialog',
+  is: 'oobe-a11y-option',

[michaelpg, 2016/08/09 20:33:08]

should match file name

[Alexander Alekseev, 2016/08/10 04:03:46]

Done.

 
   properties: {
     /**
-     * Controls visibility of the bottom-buttons element.
+     * If polymer-toggle-button is checked.
      */
-    hasButtons: {
+    checked: {
       type: Boolean,
       value: false,

[michaelpg, 2016/08/09 20:33:08]

consider leaving off the default value -- it always gets set by preferences,
right? if so, no reason to make it initialize to false and then become true

[Alexander Alekseev, 2016/08/10 04:03:46]

Done.

     },
+
+    /**
+     * Chrome message handling this option.
+     */
+    chromeMessage: {
+      type: String,
+      value: null,
+    },
   },
 });