Test:
Merged: https://chromium-review.googlesource.com/c/infra/gerrit-plugins/buildbucket/+/3600858

Created new CL in same branch:
https://chromium-review.googlesource.com/c/infra/gerrit-plugins/buildbucket/+/3609588

Bug: 1312511

Change-Id: I20ccfc978fd84c4c68f71007cf636fc1ee8e3d4d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3609115Reviewed-by: Gavin Mak <gavinmak@google.com>
Commit-Queue: Joanna Wang <jojwang@chromium.org>