GitLab

Cut-and-paste these classes into separate files, because their current
location is getting crowded.

Bug: 859152
Change-Id: I9bc9fe8225589f91ba1cbc9daaccfbe58288197f
Reviewed-on: https://chromium-review.googlesource.com/c/1277581Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: ccameron <ccameron@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599335}