ChromeOS OOBE: OOBE should listen to notification of keyboard layout update.

chrome/browser/resources/chromeos/login/oobe_welcome.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.
 
 /**
  * @fileoverview Polymer element for displaying material design OOBE.
  */
 
 Polymer({
   is: 'oobe-welcome-md',
@@ skipping 386 matching lines @@
     var item = event.detail;
     var inputMethodId = item.value;
     this.currentKeyboard = item.title;
     this.screen.onKeyboardSelected_(inputMethodId);
   },
 
   onLanguagesChanged_: function() {
     this.currentLanguage = Oobe.getSelectedTitle(this.languages);
   },
 
+  setSelectedKeyboard: function(keyboard_id) {
+    var found = false;
+    for (var i = 0; i < this.keyboards.length; ++i) {
+      if (this.keyboards[i].value != keyboard_id) {
+        this.keyboards[i].selected = false;
+        continue;
+      }
+      this.keyboards[i].selected = true;
+      found = true;
+    }
+    if (!found)
+      return;
+
+    // Force i18n-dropdown to refresh.
+    this.keyboards = this.keyboards.slice();
+    this.onKeyboardsChanged_();
+  },
+
   onKeyboardsChanged_: function() {
     this.currentKeyboard = Oobe.getSelectedTitle(this.keyboards);
   },
 
   /**
    * Handle "OK" button for "LanguageSelection" screen.
    *
    * @private
    */
   closeLanguageSection_: function() {
@@ skipping 42 matching lines @@
    * @private
    */
   onTimezoneSelected_: function(event) {
     var item = event.detail;
     if (!item)
       return;
 
     this.screen.onTimezoneSelected_(item.value);
   },
 });