[CrOS Tether] Update NetworkState to include tether properties and integrate into NetworkStateHandl…

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 284 matching lines @@
     var firstConnectedNetwork = null;
     networkStates.forEach(function(networkState) {
       var type = networkState.Type;
       if (!activeNetworkStatesByType.has(type)) {
         activeNetworkStatesByType.set(type, networkState);
         if (!firstConnectedNetwork && networkState.Type != CrOnc.Type.VPN &&
             networkState.ConnectionState == CrOnc.ConnectionState.CONNECTED) {
           firstConnectedNetwork = networkState;
         }
       }
-      newNetworkStateLists[type].push(networkState);
+      if (newNetworkStateLists.hasOwnProperty(type)) {
+        newNetworkStateLists[type].push(networkState);
+      }
     }, this);
 
     this.defaultNetwork = firstConnectedNetwork;
 
     // Create a VPN entry in deviceStates if there are any VPN networks.
     if (newNetworkStateLists.VPN && newNetworkStateLists.VPN.length > 0) {
       newDeviceStates.VPN = /** @type {DeviceStateProperties} */ ({
         Type: CrOnc.Type.VPN,
         State: chrome.networkingPrivate.DeviceStateType.ENABLED
       });
@@ skipping 21 matching lines @@
       newActiveNetworkStates.push(state);
       this.activeNetworkIds_.add(state.GUID);
     }
 
     this.deviceStates = newDeviceStates;
     this.networkStateLists_ = newNetworkStateLists;
     // Set activeNetworkStates last to rebuild the dom-repeat.
     this.activeNetworkStates_ = newActiveNetworkStates;
   },
 });