[cros] Error bubble on login is displayed to the left of Gaia frame.

chrome/browser/resources/chromeos/login/header_bar.js

 // Copyright (c) 2012 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 Login UI header bar implementation.
  */
 
 cr.define('login', function() {
   // Network state constants.
@@ skipping 72 matching lines @@
    * been recieved.
    * @param {Integer} state Current state of the network (see NET_STATE).
    * @param {string} network Name of the network.
    * @param {string} reason Reason the callback was called.
    * @param {int} last Last active network type.
    */
   HeaderBar.handleAddUser = function(state, network, reason, last) {
     if (state != NET_STATE.OFFLINE) {
       Oobe.showSigninUI();
     } else {
-      $('bubble').showTextForElement($('add-user-button'),
-          localStrings.getString('addUserErrorMessage'));
+      $('bubble').showTextForElement(
+          $('add-user-button'),
+          localStrings.getString('addUserErrorMessage'),
+          cr.ui.Bubble.Attachment.BOTTOM);
       chrome.send('loginAddNetworkStateObserver',
                   ['login.HeaderBar.bubbleWatchdog']);
     }
   };
 
   /**
    * Observes network state, and close the bubble when network becomes online.
    * @param {Integer} state Current state of the network (see NET_STATE).
    * @param {string} network Name of the network.
    * @param {string} reason Reason the callback was called.
    * @param {int} last Last active network type.
    */
   HeaderBar.bubbleWatchdog = function(state, network, reason, last) {
     if (state != NET_STATE.OFFLINE) {
       $('bubble').hideForElement($('add-user-button'));
       chrome.send('loginRemoveNetworkStateObserver',
                   ['login.HeaderBar.bubbleWatchdog']);
     }
   };
 
   return {
     HeaderBar: HeaderBar
   };
 });