login-webui: Close any bubble when window loses focus.

chrome/browser/resources/chromeos/login/bubble.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 Bubble implementation.
  */
 
 // TODO(xiyuan): Move this into shared.
 cr.define('cr.ui', function() {
@@ skipping 20 matching lines @@
 
     // Anchor element
     anchor_: undefined,
 
     /** @inheritDoc */
     decorate: function() {
       this.ownerDocument.addEventListener('click',
                                           this.handleDocClick_.bind(this));
       this.ownerDocument.addEventListener('keydown',
                                           this.handleDocKeyDown_.bind(this));
+      window.addEventListener('blur', this.handleWindowBlur_.bind(this));
       this.addEventListener('webkitTransitionEnd',
                             this.handleTransitionEnd_.bind(this));
     },
 
     /**
      * Sets the attachment of the bubble.
      * @param {!Attachment} attachment Bubble attachment.
      */
     setAttachment_: function (attachment) {
       for (var k in Bubble.Attachment) {
@@ skipping 157 matching lines @@
         this.hide();
     },
 
     /**
      * Handle of document keydown event.
      * @private
      */
     handleDocKeyDown_: function(e) {
       if (!this.hidden)
         this.hide();
+    },
+
+    /**
+     * Handler of window blur event.
+     * @private
+     */
+    handleWindowBlur_: function(e) {
+      if (!this.hidden)
+        this.hide();
     }
   };
 
   return {
     Bubble: Bubble
   };
 });