GitLab

This command source adds commands to create a new Doc, Sheet, Meet etc.
It doesn't require any integration, since it takes advantage of the new
docs.new etc. URLs.

(This change also populates CommanderController's default command sources)

Bug: 1014639
Change-Id: I1acef15e9eac2cda11b0087419ee8ccb6328dd9f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2442871
Commit-Queue: Leonard Grey <lgrey@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812940}