[CrOS Tether] Add tether network properties (battery percentage, carrier, and signal strength) to t…

chromeos/network/tether_constants.h

+// 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.
+#ifndef CHROMEOS_NETWORK_TETHER_CONSTANTS_H_
+#define CHROMEOS_NETWORK_TETHER_CONSTANTS_H_
+
+#include "chromeos/chromeos_export.h"
+
+namespace chromeos {
+
+// This file contains constants for Chrome OS tether networks which are used
+// wherever Shill constants are appropriate. Tether networks are a Chrome OS
+// concept which does not exist as part of Shill, so these custom definitions
+// are used instead. Tether networks are never intended to be passed to Shill
+// code, so these constants are used primarily as part of NetworkStateHandler.
+
+// Represents the tether network type.
+CHROMEOS_EXPORT extern const char kTypeTether[];
+
+// Properties associated with tether networks.
+CHROMEOS_EXPORT extern const char kTetherBatteryPercentage[];
+CHROMEOS_EXPORT extern const char kTetherCarrier[];
+CHROMEOS_EXPORT extern const char kTetherSignalStrength[];
+
+}  // namespace chromeos
+
+#endif  // CHROMEOS_NETWORK_TETHER_CONSTANTS_H_