This adds ownership of tests.

Bug: chromium:1056170
Change-Id: Ibed6ee0024d34c886817d273660922d5cc6865ec
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2141734Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Hannes Payer <hpayer@chromium.org>
Commit-Queue: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67106}