Configuration for download service.

components/download/public/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.
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
 }
 
 source_set("public") {
   sources = [
     "client.h",
     "clients.h",
     "download_params.cc",
     "download_params.h",
     "download_service.h",
+    "features.cc",
+    "features.h",
   ]
 
   deps = [
     "//components/keyed_service/core",
   ]
 
   public_deps = [
     "//base",
     "//net",
     "//url",
   ]
 }