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

chromeos/network/network_connection_handler.cc

 // Copyright (c) 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.
 
 #include "chromeos/network/network_connection_handler.h"
 
 #include "base/bind.h"
 #include "base/json/json_reader.h"
 #include "base/location.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 100 matching lines @@
     "disconnect-failed";
 const char NetworkConnectionHandler::kErrorConfigureFailed[] =
     "configure-failed";
 const char NetworkConnectionHandler::kErrorConnectCanceled[] =
     "connect-canceled";
 const char NetworkConnectionHandler::kErrorCertLoadTimeout[] =
     "cert-load-timeout";
 const char NetworkConnectionHandler::kErrorUnmanagedNetwork[] =
     "unmanaged-network";
 const char NetworkConnectionHandler::kErrorActivateFailed[] = "activate-failed";
+const char NetworkConnectionHandler::kEnabledOrDisabledWhenNotAvailable[] =
+    "not-available";
 
 struct NetworkConnectionHandler::ConnectRequest {
   ConnectRequest(const std::string& service_path,
                  const std::string& profile_path,
                  const base::Closure& success,
                  const network_handler::ErrorCallback& error)
       : service_path(service_path),
         profile_path(profile_path),
         connect_state(CONNECT_REQUESTED),
         success_callback(success),
@@ skipping 679 matching lines @@
 
 void NetworkConnectionHandler::HandleShillDisconnectSuccess(
     const std::string& service_path,
     const base::Closure& success_callback) {
   NET_LOG_EVENT("Disconnect Request Sent", service_path);
   if (!success_callback.is_null())
     success_callback.Run();
 }
 
 }  // namespace chromeos