Add a delay to send the parallel requests.

content/browser/download/parallel_download_utils.h

 // 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 CONTENT_BROWSER_DOWNLOAD_PARALLEL_DOWNLOAD_UTILS_H_
 #define CONTENT_BROWSER_DOWNLOAD_PARALLEL_DOWNLOAD_UTILS_H_
 
 #include <vector>
 
 #include "content/common/content_export.h"
@@ skipping 17 matching lines @@
 // Finch configuration utilities.
 //
 // Get the minimum slice size to use parallel download from finch configuration.
 // A slice won't be further chunked into smaller slices if the size is less
 // than the minimum size.
 CONTENT_EXPORT int64_t GetMinSliceSizeConfig();
 
 // Get the request count for parallel download from finch configuration.
 CONTENT_EXPORT int GetParallelRequestCountConfig();
 
+// Get the time delay to send parallel requests after the response of original
+// request is handled.
+CONTENT_EXPORT base::TimeDelta GetParallelRequestDelayConfig();
+
 }  //  namespace content
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_PARALLEL_DOWNLOAD_UTILS_H_