Retrieve the list of keyboard layouts for public sessions async

ui/login/account_picker/user_pod_row.js

Index: ui/login/account_picker/user_pod_row.js
diff --git a/ui/login/account_picker/user_pod_row.js b/ui/login/account_picker/user_pod_row.js
index fe0d12a5e6bc1190055eeb1236c9da38ed0acf97..684039ded158a373b8b0748d010eac324b486812 100644
--- a/ui/login/account_picker/user_pod_row.js
+++ b/ui/login/account_picker/user_pod_row.js
@@ -1054,12 +1054,9 @@ cr.define('login', function() {
 
       var languageSelect = this.querySelector('.language-select');
       languageSelect.tabIndex = UserPodTabOrder.POD_INPUT;
-      languageSelect.addEventListener('change', function() {
-        chrome.send('getPublicSessionKeyboardLayouts', [
-            this.user.username,
-            languageSelect.options[languageSelect.selectedIndex].value]);
-      }.bind(this));
-
+      languageSelect.addEventListener(
+          'change',
+          this.getPublicSessionKeyboardLayouts_.bind(this));
       this.querySelector('.keyboard-select').tabIndex =
           UserPodTabOrder.POD_INPUT;
 
@@ -1100,7 +1097,8 @@ cr.define('login', function() {
       id = this.user.username + '-keyboard';
       this.querySelector('.keyboard-select-label').htmlFor = id;
       this.querySelector('.keyboard-select').setAttribute('id', id);
-      this.populateKeyboardSelect_(this.user.initialKeyboardLayouts);
+      this.populateKeyboardSelect_([this.user.initialKeyboardLayout]);
+      this.getPublicSessionKeyboardLayouts_();
     },
 
     /** @override **/
@@ -1212,6 +1210,17 @@ cr.define('login', function() {
     },
 
     /**
+     * Retrieves the list of keyboard layouts available for the currently
+     * selected locale.
+     */
+    getPublicSessionKeyboardLayouts_: function() {
+      var languageSelect = this.querySelector('.language-select');
+      chrome.send('getPublicSessionKeyboardLayouts', [
+                  this.user.username,
+                  languageSelect.options[languageSelect.selectedIndex].value]);
+     },
+
+    /**
      * Populates the keyboard layout "select" element with a list of layouts.
      * @param {!Object} list List of available keyboard layouts
      */