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

chromeos/components/tether/initializer.h

Index: chromeos/components/tether/initializer.h
diff --git a/chromeos/components/tether/initializer.h b/chromeos/components/tether/initializer.h
index abb4e919600856ca3829727a8c876e84ed486b03..c633bebe9196468ad3981bf40e6fdfb8c4017d58 100644
--- a/chromeos/components/tether/initializer.h
+++ b/chromeos/components/tether/initializer.h
@@ -39,6 +39,7 @@ class HostScanDevicePrioritizer;
 class LocalDeviceDataProvider;
 class NotificationPresenter;
 class TetherConnector;
+class TetherDeviceStateManager;
 class TetherHostFetcher;
 class WifiHotspotConnector;
 
@@ -94,6 +95,7 @@ class Initializer : public OAuth2TokenService::Observer {
   // Declare new objects in the order that they will be created during
   // initialization to ensure that they are destroyed in the correct order. This
   // order will be enforced by InitializerTest.TestCreateAndDestroy.
+  std::unique_ptr<TetherDeviceStateManager> tether_device_state_manager_;
   std::unique_ptr<TetherHostFetcher> tether_host_fetcher_;
   std::unique_ptr<LocalDeviceDataProvider> local_device_data_provider_;
   std::unique_ptr<cryptauth::RemoteBeaconSeedFetcher>