This will help make the deqp support code platform agnostic.

BUG=angleproject:892

Change-Id: I6f8c738ed8125057db87afea2079583f8feac977
Reviewed-on: https://chromium-review.googlesource.com/276201Reviewed-by: Geoff Lang <geofflang@chromium.org>
Tested-by: Corentin Wallez <cwallez@chromium.org>