The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/2269e30d4ea0874704bfbd4021c087ba960e7ea5

commit 2269e30d4ea0874704bfbd4021c087ba960e7ea5
Author: qinmin <qinmin@chromium.org>
Date: Thu Apr 20 21:04:52 2017

Add new UMA stats for parallelizable download

To study the effectiveness of parallel download,
we want to compare the bandwidth if parallel downloads are not parallelized.
Because parallel download has requirements on file size, so comparing with all
other downloads is be fair.
This CL records the UMA metrics for downloads that satisfy the requirement
of parallel download, while don't use parallel requests.

BUG=644352, 712892 

Review-Url: https://codereview.chromium.org/2823273004
Cr-Commit-Position: refs/heads/master@{#466128}

[modify] https://crrev.com/2269e30d4ea0874704bfbd4021c087ba960e7ea5/content/browser/download/download_browsertest.cc
[modify] https://crrev.com/2269e30d4ea0874704bfbd4021c087ba960e7ea5/content/browser/download/download_file.h
[modify] https://crrev.com/2269e30d4ea0874704bfbd4021c087ba960e7ea5/content/browser/download/download_file_impl.cc
[modify] https://crrev.com/2269e30d4ea0874704bfbd4021c087ba960e7ea5/content/browser/download/download_file_impl.h
[modify] https://crrev.com/2269e30d4ea0874704bfbd4021c087ba960e7ea5/content/browser/download/download_file_unittest.cc
[modify] https://crrev.com/2269e30d4ea0874704bfbd4021c087ba960e7ea5/content/browser/download/download_item_impl.cc
[modify] https://crrev.com/2269e30d4ea0874704bfbd4021c087ba960e7ea5/content/browser/download/download_item_impl_unittest.cc
[modify] https://crrev.com/2269e30d4ea0874704bfbd4021c087ba960e7ea5/content/browser/download/download_job.cc
[modify] https://crrev.com/2269e30d4ea0874704bfbd4021c087ba960e7ea5/content/browser/download/download_job.h
[modify] https://crrev.com/2269e30d4ea0874704bfbd4021c087ba960e7ea5/content/browser/download/download_job_factory.cc
[modify] https://crrev.com/2269e30d4ea0874704bfbd4021c087ba960e7ea5/content/browser/download/download_job_impl.cc
[modify] https://crrev.com/2269e30d4ea0874704bfbd4021c087ba960e7ea5/content/browser/download/download_job_impl.h
[modify] https://crrev.com/2269e30d4ea0874704bfbd4021c087ba960e7ea5/content/browser/download/download_stats.cc
[modify] https://crrev.com/2269e30d4ea0874704bfbd4021c087ba960e7ea5/content/browser/download/download_stats.h
[modify] https://crrev.com/2269e30d4ea0874704bfbd4021c087ba960e7ea5/content/browser/download/mock_download_file.cc
[modify] https://crrev.com/2269e30d4ea0874704bfbd4021c087ba960e7ea5/content/browser/download/mock_download_file.h
[modify] https://crrev.com/2269e30d4ea0874704bfbd4021c087ba960e7ea5/content/browser/download/parallel_download_job.cc
[modify] https://crrev.com/2269e30d4ea0874704bfbd4021c087ba960e7ea5/content/browser/download/parallel_download_job.h
[modify] https://crrev.com/2269e30d4ea0874704bfbd4021c087ba960e7ea5/content/browser/download/parallel_download_utils.cc
[modify] https://crrev.com/2269e30d4ea0874704bfbd4021c087ba960e7ea5/content/browser/download/parallel_download_utils.h
[modify] https://crrev.com/2269e30d4ea0874704bfbd4021c087ba960e7ea5/content/public/test/test_file_error_injector.cc
[modify] https://crrev.com/2269e30d4ea0874704bfbd4021c087ba960e7ea5/tools/metrics/histograms/histograms.xml

Please tag with applicable OSs.  Thanks.

Your change meets the bar and is auto-approved for M59. Please go ahead and merge the CL to branch 3071 manually. Please contact milestone owner if you have questions.
Owners: amineer@(Android), cmasso@(iOS), gkihumba@(ChromeOS), Abdul Syed@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/f7823c3140937e3fbfdc8eee48dfd780707b78e3

commit f7823c3140937e3fbfdc8eee48dfd780707b78e3
Author: Min Qin <qinmin@chromium.org>
Date: Mon Apr 24 17:44:06 2017

Add new UMA stats for parallelizable download

To study the effectiveness of parallel download,
we want to compare the bandwidth if parallel downloads are not parallelized.
Because parallel download has requirements on file size, so comparing with all
other downloads is be fair.
This CL records the UMA metrics for downloads that satisfy the requirement
of parallel download, while don't use parallel requests.

BUG=644352, 712892 
TBR=dtrainor@chromium.org,alexmos@chromium.org,isherman@chromium.org

Review-Url: https://codereview.chromium.org/2823273004
Cr-Commit-Position: refs/heads/master@{#466128}
(cherry picked from commit 2269e30d4ea0874704bfbd4021c087ba960e7ea5)

Review-Url: https://codereview.chromium.org/2839693002 .
Cr-Commit-Position: refs/branch-heads/3071@{#168}
Cr-Branched-From: a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}

[modify] https://crrev.com/f7823c3140937e3fbfdc8eee48dfd780707b78e3/content/browser/download/download_browsertest.cc
[modify] https://crrev.com/f7823c3140937e3fbfdc8eee48dfd780707b78e3/content/browser/download/download_file.h
[modify] https://crrev.com/f7823c3140937e3fbfdc8eee48dfd780707b78e3/content/browser/download/download_file_impl.cc
[modify] https://crrev.com/f7823c3140937e3fbfdc8eee48dfd780707b78e3/content/browser/download/download_file_impl.h
[modify] https://crrev.com/f7823c3140937e3fbfdc8eee48dfd780707b78e3/content/browser/download/download_file_unittest.cc
[modify] https://crrev.com/f7823c3140937e3fbfdc8eee48dfd780707b78e3/content/browser/download/download_item_impl.cc
[modify] https://crrev.com/f7823c3140937e3fbfdc8eee48dfd780707b78e3/content/browser/download/download_item_impl_unittest.cc
[modify] https://crrev.com/f7823c3140937e3fbfdc8eee48dfd780707b78e3/content/browser/download/download_job.cc
[modify] https://crrev.com/f7823c3140937e3fbfdc8eee48dfd780707b78e3/content/browser/download/download_job.h
[modify] https://crrev.com/f7823c3140937e3fbfdc8eee48dfd780707b78e3/content/browser/download/download_job_factory.cc
[modify] https://crrev.com/f7823c3140937e3fbfdc8eee48dfd780707b78e3/content/browser/download/download_job_impl.cc
[modify] https://crrev.com/f7823c3140937e3fbfdc8eee48dfd780707b78e3/content/browser/download/download_job_impl.h
[modify] https://crrev.com/f7823c3140937e3fbfdc8eee48dfd780707b78e3/content/browser/download/download_stats.cc
[modify] https://crrev.com/f7823c3140937e3fbfdc8eee48dfd780707b78e3/content/browser/download/download_stats.h
[modify] https://crrev.com/f7823c3140937e3fbfdc8eee48dfd780707b78e3/content/browser/download/mock_download_file.cc
[modify] https://crrev.com/f7823c3140937e3fbfdc8eee48dfd780707b78e3/content/browser/download/mock_download_file.h
[modify] https://crrev.com/f7823c3140937e3fbfdc8eee48dfd780707b78e3/content/browser/download/parallel_download_job.cc
[modify] https://crrev.com/f7823c3140937e3fbfdc8eee48dfd780707b78e3/content/browser/download/parallel_download_job.h
[modify] https://crrev.com/f7823c3140937e3fbfdc8eee48dfd780707b78e3/content/browser/download/parallel_download_utils.cc
[modify] https://crrev.com/f7823c3140937e3fbfdc8eee48dfd780707b78e3/content/browser/download/parallel_download_utils.h
[modify] https://crrev.com/f7823c3140937e3fbfdc8eee48dfd780707b78e3/content/public/test/test_file_error_injector.cc
[modify] https://crrev.com/f7823c3140937e3fbfdc8eee48dfd780707b78e3/tools/metrics/histograms/histograms.xml