[CrOS Tether] Add the notion of a tether DeviceState.

chromeos/components/tether/BUILD.gn

 # Copyright 2016 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.
 
 assert(is_chromeos, "Non-ChromeOS builds cannot depend on //chromeos")
 
 static_library("tether") {
   sources = [
     "active_host.cc",
     "active_host.h",
@@ skipping 31 matching lines @@
     "local_device_data_provider.h",
     "message_transfer_operation.cc",
     "message_transfer_operation.h",
     "message_wrapper.cc",
     "message_wrapper.h",
     "notification_presenter.h",
     "pref_names.cc",
     "pref_names.h",
     "tether_connector.cc",
     "tether_connector.h",
+    "tether_device_state_manager.cc",
+    "tether_device_state_manager.h",
     "tether_host_fetcher.cc",
     "tether_host_fetcher.h",
     "tether_network_disconnection_handler.cc",
     "tether_network_disconnection_handler.h",
     "wifi_hotspot_connector.cc",
     "wifi_hotspot_connector.h",
   ]
 
   deps = [
     "//base",
@@ skipping 87 matching lines @@
     "//components/cryptauth/ble",
     "//components/prefs:test_support",
     "//components/signin/core/browser:test_support",
     "//device/bluetooth",
     "//device/bluetooth:mocks",
     "//testing/gmock",
     "//testing/gtest",
     "//ui/message_center:test_support",
   ]
 }