[CrOS Tether] Add tether settings section to the MD settings page.

chrome/browser/resources/chromeos/network_ui/network_ui.js

 // Copyright 2013 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.
 
 var NetworkUI = (function() {
   'use strict';
 
   CrOncStrings = {
     OncTypeCellular: loadTimeData.getString('OncTypeCellular'),
     OncTypeEthernet: loadTimeData.getString('OncTypeEthernet'),
+    OncTypeTether: loadTimeData.getString('OncTypeTether'),
     OncTypeVPN: loadTimeData.getString('OncTypeVPN'),
     OncTypeWiFi: loadTimeData.getString('OncTypeWiFi'),
     OncTypeWiMAX: loadTimeData.getString('OncTypeWiMAX'),
     networkListItemConnected:
         loadTimeData.getString('networkListItemConnected'),
     networkListItemConnecting:
         loadTimeData.getString('networkListItemConnecting'),
     networkListItemConnectingTo:
         loadTimeData.getString('networkListItemConnectingTo'),
     networkListItemNotConnected:
@@ skipping 344 matching lines @@
   });
 
   document.addEventListener('custom-item-selected', function(event) {
     chrome.send('addNetwork', [event.detail.customData]);
   });
 
   return {
     getShillPropertiesResult: getShillPropertiesResult
   };
 })();