GitLab

This matches the convention used by the infra repo's starlark code and
puts files that are more closely related closer to each in other in the
hierarchy.

Change-Id: I49ce3def16bef580063b2bf8ffe95ee56505ed4c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2161622
Commit-Queue: Garrett Beaty <gbeaty@chromium.org>
Reviewed-by: Aaron Gable <agable@chromium.org>
Cr-Commit-Position: refs/heads/master@{#762100}