Fail the dEQP tests early if the case list is not found. BUG=580045 Change-Id: I917f62dca047ca163bfdbcc5437b2fc1d7a1e020 Reviewed-on: https://chromium-review.googlesource.com/326401 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Corentin Wallez <cwallez@chromium.org>