This allows us to stop duplicating some information in the impl. BUG=angleproject:1635 Change-Id: If8f7d2418571c3254729f48c463814ec18ed2644 Reviewed-on: https://chromium-review.googlesource.com/469153 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Corentin Wallez <cwallez@chromium.org>
