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

chromeos/network/tether_constants.cc

Index: chromeos/network/tether_constants.cc
diff --git a/chromeos/network/tether_constants.cc b/chromeos/network/tether_constants.cc
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index 0000000000000000000000000000000000000000..70867b5a178b227582a745be6c847e0c88988e98
--- /dev/null
+++ b/chromeos/network/tether_constants.cc
@@ -0,0 +1,14 @@
+// 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.
+
+#include "chromeos/network/tether_constants.h"
+
+namespace chromeos {
+
+const char kTypeTether[] = "wifi-tether";
+const char kTetherBatteryPercentage[] = "Tether.BatteryPercentage";
+const char kTetherCarrier[] = "Tether.Carrier";
+const char kTetherSignalStrength[] = "Tether.SignalStrength";
+
+}  // namespace chromeos