Ship OffscreenCanvas and Worker.requestAnimationFrame

Bug: 563816
Change-Id: I3939845a5c512f7a1975b2da7592595572cbc522
Reviewed-on: https://chromium-review.googlesource.com/1119156
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Reviewed-by: Justin Novosad <junov@chromium.org>
Commit-Queue: Fernando Serboncini <fserb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#571657}
5 files changed