GitLab

This adds some of the required harness for testing the paint preview
player. It also implements a basic smoke test for the player.

A follow-up CL will add more comprehensive tests to this suite.

Bug: 1049303,1032580
Change-Id: I7694a6b264c3f654476714de38fd613c356dbfde
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2040061Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Reviewed-by: Calder Kitagawa <ckitagawa@chromium.org>
Commit-Queue: Mehran Mahmoudi <mahmoudi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739462}