This allows it to be more easily reused in a project, e.g.
https://chromium-review.googlesource.com/c/chromium/src/+/2895086

Bug: 1209079
Change-Id: Ib50f2fcca3489dda60328589a7489d76f1d83ffe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2896584Reviewed-by: Dirk Pranke <dpranke@google.com>
Commit-Queue: Evan Stade <estade@chromium.org>