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

chromeos/network/network_connection_handler.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROMEOS_NETWORK_NETWORK_CONNECTION_HANDLER_H_
 #define CHROMEOS_NETWORK_NETWORK_CONNECTION_HANDLER_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 84 matching lines @@
 
   // Certificate load timed out.
   static const char kErrorCertLoadTimeout[];
 
   // Trying to configure an unmanged network but policy prohibits that
   static const char kErrorUnmanagedNetwork[];
 
   // Network activation failed.
   static const char kErrorActivateFailed[];
 
+  // Network was enabled/disabled when it was not available.
+  static const char kEnabledOrDisabledWhenNotAvailable[];
+
   ~NetworkConnectionHandler() override;
 
   void AddObserver(NetworkConnectionObserver* observer);
   void RemoveObserver(NetworkConnectionObserver* observer);
 
   // ConnectToNetwork() will start an asynchronous connection attempt.
   // On success, |success_callback| will be called.
   // On failure, |error_callback| will be called with |error_name| one of the
   //   constants defined above.
   // |error_message| will contain an additional error string for debugging.
@@ skipping 138 matching lines @@
   bool logged_in_;
   bool certificates_loaded_;
   base::TimeTicks logged_in_time_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkConnectionHandler);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_NETWORK_NETWORK_CONNECTION_HANDLER_H_