Flakyness noticed there:
https://ci.chromium.org/buildbot/tryserver.chromium.angle/mac_angle_rel_ng/
https://ci.chromium.org/buildbot/chromium.gpu.fyi/Mac%20FYI%20Release%20%28Intel%29/

Introduced in:
https://chromium-review.googlesource.com/c/angle/angle/+/913108

Change-Id: I9cbd76c0472d023005ded9f957b304a4a769c619
Reviewed-on: https://chromium-review.googlesource.com/919547
Commit-Queue: Luc Ferron <lucferron@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>