GitLab

Will be used in a followup CL to simplify making examples for a new
layout manager without having to duplicate a bunch of code.

Change-Id: I3a37dc1656f70015170434c9da80ccbc20c1db88
Reviewed-on: https://chromium-review.googlesource.com/c/1351968Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Dana Fried <dfried@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611825}