All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=923536

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=dbf696ffd8ac077ad00c27556402a78cac118f2aca95c34c50685ae28a1e660f


Bot(s) for this bug's original alert(s):

linux-perf

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/13ab18bc540000

📍 Couldn't reproduce a difference.
https://pinpoint-dot-chromeperf.appspot.com/job/13ab18bc540000

Maybe similar to issue 921342

https://chrome-isolated.appspot.com/browse?namespace=default-gzip&hash=26ea4e13d253cc91b55701074e678a3e8f14a86c

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/f622e65f3176520f2b3c8a40dd67c14f7f7e603b

commit f622e65f3176520f2b3c8a40dd67c14f7f7e603b
Author: bsheedy <bsheedy@chromium.org>
Date: Sat Jan 19 00:21:34 2019

Disable gtest to histogram conversion

Disables the automatic conversion from gtest perf test JSON to
histograms on LUCI builders, as there are issues with data getting
halved for no obvious reason and the assumption that smaller is better
not working for some metrics.

Bug: 921342, 923536
Change-Id: I88b80e9d8d38798c413d46420c16266951861085
Reviewed-on: https://chromium-review.googlesource.com/c/1409693
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#624375}
[modify] https://crrev.com/f622e65f3176520f2b3c8a40dd67c14f7f7e603b/tools/perf/process_perf_results.py