cr-network-select: implement focus()

ui/webui/resources/cr_elements/network/cr_network_select.js

 // Copyright 2015 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 wrapping cr-network-list including the
  * networkingPrivate calls to populate it.
  */
 
 Polymer({
@@ skipping 38 matching lines @@
      * @private {!Array<!CrOnc.NetworkStateProperties>}
      */
     networkStateList_: {
       type: Array,
       value: function() {
         return [];
       },
     },
   },
 
+  focus: function() {
+    this.$.networkList.focus();
+  },
+
   /**
    * Listener function for chrome.networkingPrivate.onNetworkListChanged event.
    * @type {function(!Array<string>)}
    * @private
    */
   networkListChangedListener_: function() {},
 
   /**
    * Listener function for chrome.networkingPrivate.onDeviceStateListChanged
    * event.
@@ skipping 96 matching lines @@
   },
 
   /**
    * @param {?CrOnc.NetworkStateProperties} state
    * @private
    */
   defaultNetworkChanged_: function(state) {
     this.fire('default-network-changed', state);
   },
 });