Fix reset and focus issues in OOBE

chrome/renderer/resources/extensions/automation_custom_bindings.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.
 
 // Custom bindings for the automation API.
 var AutomationNode = require('automationNode').AutomationNode;
 var AutomationRootNode = require('automationNode').AutomationRootNode;
 var automation = require('binding').Binding.create('automation');
 var automationInternal =
     require('binding').Binding.create('automationInternal').generate();
@@ skipping 194 matching lines @@
   // A WebView in the desktop tree has a different AX tree as its child.
   // When we encounter a WebView with a child AX tree id that we don't
   // currently have cached, explicitly request that AX tree from the
   // browser process and set up a callback when it loads to attach that
   // tree as a child of this node and fire appropriate events.
   var childTreeID = GetIntAttribute(treeID, nodeID, 'childTreeId');
   if (!childTreeID)
     return;
 
   var subroot = AutomationRootNode.get(childTreeID);
-  if (!subroot) {
+  if (!subroot || subroot.role == schema.EventType.unknown) {
     automationUtil.storeTreeCallback(childTreeID, function(root) {
       // Return early if the root has already been attached.
       if (root.parent)
         return;
 
       privates(root).impl.setHostNode(node);
 
       if (root.docLoaded) {
         privates(root).impl.dispatchEvent(
             schema.EventType.loadComplete, 'page');
@@ skipping 111 matching lines @@
 
 var binding = automation.generate();
 // Add additional accessibility bindings not specified in the automation IDL.
 // Accessibility and automation share some APIs (see
 // ui/accessibility/ax_enums.idl).
 forEach(schema, function(k, v) {
   binding[k] = v;
 });
 
 exports.$set('binding', binding);