The following revision refers to this bug:
  https://chrome-internal.googlesource.com/chrome/ios_internal.git/+/18d5d449b697efa2da6c522a0109bd42769ed16e

commit 18d5d449b697efa2da6c522a0109bd42769ed16e
Author: Rohit Rao <rohitrao@chromium.org>
Date: Fri Jun 15 14:22:10 2018

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/10eb7aedb875bb89deaab446d3f0382c36a48bd1

commit 10eb7aedb875bb89deaab446d3f0382c36a48bd1
Author: Lindsay Pasricha <lindsayw@google.com>
Date: Tue Jun 19 19:10:13 2018

Disable UIRefresh since it's on by default on all default bots.

This will allow for waterfall coverage with uirefresh off.

Bug:  853015 
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Ie9be170bdfbb66f678bd0bd040c1d53d0cfbf9ba
Reviewed-on: https://chromium-review.googlesource.com/1105059
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Commit-Queue: Lindsay Pasricha <lindsayw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568556}
[modify] https://crrev.com/10eb7aedb875bb89deaab446d3f0382c36a48bd1/ios/build/bots/chromium.mac/UIRefresh-simulator.json

The following revision refers to this bug:
  https://chrome-internal.googlesource.com/chrome/ios_internal.git/+/d0c28da2edd640475b2c015b0ca84277dd4f2257

commit d0c28da2edd640475b2c015b0ca84277dd4f2257
Author: Lindsay Pasricha <lindsayw@google.com>
Date: Fri Jun 22 18:12:31 2018

This is fixed for upstream and downstream now.