This will make it reusable, e.g. for https://chromium-review.googlesource.com/c/465417/

Bug: none
Change-Id: I96f13c6ff3aff22c787e290979602e7a0d725213
Reviewed-on: https://chromium-review.googlesource.com/474139Reviewed-by: Robbie Iannucci <iannucci@chromium.org>
Reviewed-by: Ryan Tseng <hinoka@chromium.org>
Commit-Queue: Paweł Hajdan Jr. <phajdan.jr@chromium.org>