Add initial Controller to DownloadService

components/download/internal/test/empty_client.h

Index: components/download/internal/test/empty_client.h
diff --git a/components/download/internal/test/empty_client.h b/components/download/internal/test/empty_client.h
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index 0000000000000000000000000000000000000000..a855b204a5029dbcb57ab49874fefeef70d3d954
--- /dev/null
+++ b/components/download/internal/test/empty_client.h
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+// 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.
+
+#ifndef COMPONENTS_DOWNLOAD_INTERNAL_TEST_EMPTY_CLIENT_H_
+#define COMPONENTS_DOWNLOAD_INTERNAL_TEST_EMPTY_CLIENT_H_
+
+#include "base/macros.h"
+#include "components/download/public/client.h"
+
+namespace download {
+namespace test {
+
+class EmptyClient : public Client {
+ public:
+  EmptyClient() = default;
+  ~EmptyClient() override = default;
+
+  // Client implementation.
+  void OnServiceInitialized(
+      const std::vector<std::string>& outstanding_download_guids) override;
+  ShouldDownload OnDownloadStarted(
+      const std::string& guid,
+      const std::vector<GURL>& url_chain,
+      const scoped_refptr<const net::HttpResponseHeaders>& headers) override;
+  void OnDownloadUpdated(const std::string& guid,
+                         uint64_t bytes_downloaded) override;
+  void OnDownloadFailed(const std::string& guid) override;
+  void OnDownloadTimedOut(const std::string& guid) override;
+  void OnDownloadAborted(const std::string& guid) override;
+  void OnDownloadSucceeded(const std::string& guid,
+                           const base::FilePath& path,
+                           uint64_t size) override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(EmptyClient);
+};
+
+}  // namespace test
+}  // namespace download
+
+#endif  // COMPONENTS_DOWNLOAD_INTERNAL_TEST_EMPTY_CLIENT_H_