Port device_generic_sensor to be hosted in Device Service.

services/device/public/cpp/BUILD.gn

+# 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.
+
+import("//build/config/features.gni")
+
+# The definition of features in device_features.h are moved from

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

nit: This comment isn't needed.

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

Done.

+# //content/public/common/content_features.h".
+source_set("device_features") {
+  public = [
+    "device_features.h",
+  ]
+  sources = [
+    "device_features.cc",
+  ]
+  public_deps = [
+    "//base",
+  ]
+}