[CrOS Tether] Create HostScanDevicePrioritizer, a class which prioritizes the order of connection a…

chromeos/components/tether/pref_names.h

Index: chromeos/components/tether/pref_names.h
diff --git a/chromeos/components/tether/pref_names.h b/chromeos/components/tether/pref_names.h
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+++ b/chromeos/components/tether/pref_names.h
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+// 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_COMPONENTS_TETHER_PREF_NAMES_H_
+#define CHROMEOS_COMPONENTS_TETHER_PREF_NAMES_H_
+
+namespace chromeos {
+
+namespace tether {
+
+namespace prefs {
+
+// Preference name for the preference which stores IDs corresponding to devices
+// which have most recently replied to a TetherAvailabilityRequest with a
+// response code indicating that tethering is available. The value stored is a
+// ListValue, with the most recent response residing at the start of the list.
+extern const char kMostRecentTetherAvailablilityResponderIds[];
+
+// Preference name for the preference which stores the ID corresponding to
+// the device which has most recently replied to a ConnectTetheringRequest with
+// a response code indicating that its hotspot has started up successfully.
+extern const char kMostRecentConnectTetheringResponderId[];
+
+}  // namespace prefs
+
+}  // namespace tether
+
+}  // namespace chromeos
+
+#endif  // CHROMEOS_COMPONENTS_TETHER_PREF_NAMES_H_