kjellander@, can you take a look?

Yes, but not today. I'm sheriffing today and I have quite a backlog. 

Olga, can you send a mail with your experience to sheriffs so that everyone is aware of this?

CL in progress: https://chromium-review.googlesource.com/c/chromium/src/+/641457

+agable and authors of similar roll scripts in src/tools: FYI since I think your scripts experience the same.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/afb7e1c3e5ecab664b07cbbdeaf67283168d01cd

commit afb7e1c3e5ecab664b07cbbdeaf67283168d01cd
Author: Per <perkj@chromium.org>
Date: Thu Sep 07 07:41:28 2017

Roll WebRTC 19716:19720 (3 commits)

Changes: https://chromium.googlesource.com/external/webrtc/trunk/webrtc.git/+log/3fa5b7b..efa3277

$ git log 3fa5b7b..efa3277 --date=short --no-merges --format=%ad %ae %s
2017-09-06 eladalon@webrtc.org Thread-checkers for PeerConnectionFactory::worker_thread_
2017-09-06 ilnik@webrtc.org Add reporting of googContentType via GetStats on send side
2017-09-06 ehmaldonado@webrtc.org Revert of Add //build/android/pylib/results/ to Android isolate packaging (patchset #2 id:40001 of https://codereview.webrtc.org/3011023002/ )

TBR=perkj@chromium.org
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_chromium_archive_rel_ng;master.tryserver.chromium.mac:mac_chromium_archive_rel_ng

roll_webrtc.py: Make it possible to send CL directly to CQ

Previously the CL was sent directly to the CQ by default, but
after the Rietveld to Gerrit switch for Chromium, this is no
longer the case.
According to the documentation generated by 'git cl help upload'
the use of --send-email and --use-commit-queue seems to do what's desired.
Part of the problem is that a new WIP state is introduced in Gerrit, which
doesn't send the CL to the CQ until "Start Review" has been clicked and
started.

Bug:  756780 
Change-Id: I0513102dcf8837c36d82abd1908c7457079e852d
Reviewed-on: https://chromium-review.googlesource.com/654597
Reviewed-by: Per Kjellander <perkj@google.com>
Commit-Queue: Per Kjellander <perkj@google.com>
Cr-Commit-Position: refs/heads/master@{#500241}
[modify] https://crrev.com/afb7e1c3e5ecab664b07cbbdeaf67283168d01cd/DEPS
[modify] https://crrev.com/afb7e1c3e5ecab664b07cbbdeaf67283168d01cd/tools/roll_webrtc.py

Thanks Per for (accidentally) submitting my change as part of your CL. As it works as we want, that's fine.