Add initial Controller to DownloadService

components/download/internal/entry.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 "components/download/internal/entry.h"
 
 namespace download {
 
 Entry::Entry() = default;
 Entry::Entry(const Entry& other) = default;
+
+Entry::Entry(const DownloadParams& params)
+    : client(params.client),
+      guid(params.guid),
+      scheduling_params(params.scheduling_params),
+      request_params(params.request_params) {}
+
 Entry::~Entry() = default;
 
 }  // namespace download