Port device_generic_sensor to be hosted in Device Service.

services/device/public/cpp/device_features.cc

Index: services/device/public/cpp/device_features.cc
diff --git a/services/device/public/cpp/device_features.cc b/services/device/public/cpp/device_features.cc
new file mode 100644
index 0000000000000000000000000000000000000000..ab4b9baa4301214ef14e6de834b51238fe4ff34b
--- /dev/null
+++ b/services/device/public/cpp/device_features.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 "services/device/public/cpp/device_features.h"
+
+namespace features {
+
+// Enables sensors based on Generic Sensor API:
+// https://w3c.github.io/sensors/
+const base::Feature kGenericSensor{"GenericSensor",
+                                   base::FEATURE_DISABLED_BY_DEFAULT};
+
+}  // namespace features