Add support for custom entries in <cr_network_select/>.

chrome/browser/resources/settings/internet_page/network_summary.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 for displaying a summary of network states
  * by type: Ethernet, WiFi, Cellular, WiMAX, and VPN.
  */
 
 /** @typedef {chrome.networkingPrivate.DeviceStateProperties} */
@@ skipping 382 matching lines @@
       newDeviceStates.VPN = /** @type {DeviceStateProperties} */ ({
         Type: CrOnc.Type.VPN,
         State: chrome.networkingPrivate.DeviceStateType.ENABLED
       });
     }
 
     this.deviceStates = newDeviceStates;
   },
 
   /**
-   * Sets 'networkStates[type]' which will update the cr-network-list-item
-   * associated with 'type'.
+   * Sets 'networkStates[type]' which will update the
+   * cr-network-list-network-item associated with 'type'.
    * @param {string} type The network type.
    * @param {!CrOnc.NetworkStateProperties|undefined} state The state properties
    *     for the network to associate with |type|. May be undefined if there are
    *     no networks matching |type|.
    * @private
    */
   updateNetworkState_: function(type, state) {
     this.set('networkStates.' + type, state);
     if (state)
       this.networkIds_[state.GUID] = true;
   },
 });
 })();