Knows about CQ allow_owner_if_submittable.
No API changes.

R=vadimsh

Bug: 959098
Change-Id: Icfb3e201df4916b2e8d8923d87c474af1ae85b9e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1604465Reviewed-by: Robbie Iannucci <iannucci@chromium.org>
Reviewed-by: Vadim Shtayura <vadimsh@chromium.org>
Commit-Queue: Robbie Iannucci <iannucci@chromium.org>
Commit-Queue: Vadim Shtayura <vadimsh@chromium.org>
Auto-Submit: Andrii Shyshkalov <tandrii@chromium.org>