[CrOS Tether] Add HasConnectedToHost property for Tether networks.

third_party/closure_compiler/externs/networking_private.js

 // Copyright 2017 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.
 
 // This file was generated by:
 //   ./tools/json_schema_compiler/compiler.py.
 // NOTE: The format of types has changed. 'FooType' is now
 //   'chrome.networkingPrivate.FooType'.
 // Please run the closure compiler before committing changes.
 // See https://chromium.googlesource.com/chromium/src/+/master/docs/closure_compilation.md
@@ skipping 749 matching lines @@
  *   Authentication: string
  * }}
  * @see https://developer.chrome.com/extensions/networkingPrivate#type-EthernetStateProperties
  */
 chrome.networkingPrivate.EthernetStateProperties;
 
 /**
  * @typedef {{
  *   BatteryPercentage: (number|undefined),
  *   Carrier: (string|undefined),
+ *   HasConnectedToHost: boolean,
  *   SignalStrength: (number|undefined)
  * }}
  * @see https://developer.chrome.com/extensions/networkingPrivate#type-TetherProperties
  */
 chrome.networkingPrivate.TetherProperties;
 
 /**
  * @typedef {{
  *   AutoConnect: (boolean|undefined),
  *   Host: (string|undefined),
@@ skipping 571 matching lines @@
  */
 chrome.networkingPrivate.onDeviceStateListChanged;
 
 /**
  * Fired when a portal detection for a network completes. Sends the guid of the
  * network and the corresponding captive portal status.
  * @type {!ChromeEvent}
  * @see https://developer.chrome.com/extensions/networkingPrivate#event-onPortalDetectionCompleted
  */
 chrome.networkingPrivate.onPortalDetectionCompleted;