Add initial Controller to DownloadService

components/download/internal/test/empty_client.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/test/empty_client.h"
+
+namespace download {
+namespace test {
+
+void EmptyClient::OnServiceInitialized(
+    const std::vector<std::string>& outstanding_download_guids) {}
+
+Client::ShouldDownload EmptyClient::OnDownloadStarted(
+    const std::string& guid,
+    const std::vector<GURL>& url_chain,
+    const scoped_refptr<const net::HttpResponseHeaders>& headers) {
+  return Client::ShouldDownload::CONTINUE;
+}
+
+void EmptyClient::OnDownloadUpdated(const std::string& guid,
+                                    uint64_t bytes_downloaded) {}
+
+void EmptyClient::OnDownloadFailed(const std::string& guid) {}
+
+void EmptyClient::OnDownloadTimedOut(const std::string& guid) {}
+
+void EmptyClient::OnDownloadAborted(const std::string& guid) {}
+
+void EmptyClient::OnDownloadSucceeded(const std::string& guid,
+                                      const base::FilePath& path,
+                                      uint64_t size) {}
+
+}  // namespace test
+}  // namespace download