This can be useful in the Vulkan back-end to make validation layer
errors cause test cases to fail.

BUG=angleproject:1319

Change-Id: I523f3c874e892a2646600e4c5c554319ed8d770c
Reviewed-on: https://chromium-review.googlesource.com/342050Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>