Until now, this test mode was only active in CI. Adding it to CQ should
help catching errors earlier.

TBR=sergiyb@chromium.org

Change-Id: I19a0971ecb318eb5bca3aee435700544d0ad2dcb
Reviewed-on: https://chromium-review.googlesource.com/1131946Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
Reviewed-by: Maya Lekova <mslekova@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54750}