Support role description in automation/ChromeVox

chrome/renderer/resources/extensions/automation/automation_node.js

 // Copyright 2014 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.
 
 var AutomationEvent = require('automationEvent').AutomationEvent;
 var automationInternal =
     require('binding').Binding.create('automationInternal').generate();
 var exceptionHandler = require('uncaught_exception_handler');
 var IsInteractPermitted =
     requireNative('automationInternal').IsInteractPermitted;
@@ skipping 693 matching lines @@
     'containerLiveStatus',
     'description',
     'display',
     'htmlTag',
     'imageDataUrl',
     'language',
     'liveRelevant',
     'liveStatus',
     'name',
     'placeholder',
+    'roleDescription',
     'textInputType',
     'url',
     'value'];
 
 var boolAttributes = [
     'ariaReadonly',
     'containerLiveAtomic',
     'containerLiveBusy',
     'liveAtomic',
     'liveBusy'];
@@ skipping 442 matching lines @@
 utils.defineProperty(AutomationRootNode, 'getOrCreate', function(treeID) {
   return AutomationRootNodeImpl.getOrCreate(treeID);
 });
 
 utils.defineProperty(AutomationRootNode, 'destroy', function(treeID) {
   AutomationRootNodeImpl.destroy(treeID);
 });
 
 exports.$set('AutomationNode', AutomationNode);
 exports.$set('AutomationRootNode', AutomationRootNode);