Port device_generic_sensor to be hosted in Device Service.

services/device/public/cpp/device_features.cc

+// 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 "services/device/public/cpp/device_features.h"
+
+namespace features {
+
+const base::Feature kGenericSensor{"GenericSensor",

[blundell, 2017/03/29 09:41:59]

nit: Move the documentation as well.

[ke.he, 2017/03/29 10:05:11]

Sorry for this careless:(
Done.

+                                   base::FEATURE_DISABLED_BY_DEFAULT};
+
+}  // namespace features