Move this to a common area, out of perf tests.

Change-Id: I53d36accfe0c53789c007edfb20ba7e964947def
Reviewed-on: https://chromium-review.googlesource.com/260643Tested-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>