This is a reland of 697b2c09
Original change's description:
> Setting up the environment for testrunner refactored
> 
> Bug: v8:6917
> Change-Id: Ibc3c738ef807d37d8b76f440d9765c4d0405c021
> Reviewed-on: https://chromium-review.googlesource.com/735421
> Commit-Queue: Michał Majewski <majeski@google.com>
> Reviewed-by: Michael Achenbach <machenbach@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#48923}

Bug: v8:6917
Change-Id: I07918814ee8277eca96bcb2d330e6b08f6a0505d
Reviewed-on: https://chromium-review.googlesource.com/741621Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michał Majewski <majeski@google.com>
Cr-Commit-Position: refs/heads/master@{#49078}