Make initial focus consistent in all instances of cr-drawer.

ui/webui/resources/cr_elements/cr_drawer/cr_drawer.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.
 
 Polymer({
   is: 'cr-drawer',
   extends: 'dialog',
 
   properties: {
+    title: String,
+
     /** Enables notifications for |Dialog.open|. */
     open: {
       type: Boolean,
       notify: true,
     },
 
     /** The alignment of the drawer on the screen ('left' or 'right'). */
     align: {
       type: String,
       value: 'left',
@@ skipping 63 matching lines @@
    * Closes the dialog when the closing animation is over.
    * @private
    */
   onDialogTransitionEnd_: function() {
     if (this.classList.contains('closing')) {
       this.classList.remove('closing');
       this.close();
     }
   },
 });