Add a delay to send the parallel requests.

content/browser/download/parallel_download_job.h

Index: content/browser/download/parallel_download_job.h
diff --git a/content/browser/download/parallel_download_job.h b/content/browser/download/parallel_download_job.h
index 8d02a7984fb2992982c724f9be56fb6586b11d17..70c429877dfcd69045f52fb09fd4e99f7ca05863 100644
--- a/content/browser/download/parallel_download_job.h
+++ b/content/browser/download/parallel_download_job.h
@@ -9,6 +9,7 @@
 #include <vector>
 
 #include "base/macros.h"
+#include "base/timer/timer.h"
 #include "content/browser/download/download_job_impl.h"
 #include "content/browser/download/download_worker.h"
 #include "content/common/content_export.h"
@@ -60,6 +61,9 @@ class CONTENT_EXPORT ParallelDownloadJob : public DownloadJobImpl {
   // Subsequent tasks to send range requests.
   WorkerList workers_;
 
+  // Used to send parallel requests after a delay based on Finch config.
+  std::unique_ptr<base::OneShotTimer> timer_;

[qinmin, 2017/03/15 05:49:18]

You don't need the unique_ptr, just use base::OneShotTimer timer_.

[xingliu, 2017/03/15 17:48:52]

Done, make sense.

+
   DISALLOW_COPY_AND_ASSIGN(ParallelDownloadJob);
 };