GitLab

This makes the new trybots actually build the same targets
as the waterfall bots, rather than 'all' (which doesn't
work at the moment).

TBR=phajdan.jr@chromium.org
BUG=477879

Review URL: https://codereview.chromium.org/1078983006

Cr-Commit-Position: refs/heads/master@{#326979}