Flags are copied from infra side's builders.py. They will be removed
afterwards with: https://crrev.com/c/1288412

NOTRY=true
TBR=sergiyb@chromium.org

Bug: chromium:830557
Change-Id: If9794e4f9f396770219cf0563a37d6304b6a96ff
Reviewed-on: https://chromium-review.googlesource.com/c/1288589Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56762}