Making several, smaller, more-focused tests will aid in debugging
problems.

Bug: b/158337857
Change-Id: I3d1efd93a5ad7cd20352174a07f3547175eb2bb5
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2248201
Commit-Queue: Ian Elliott <ianelliott@google.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Courtney Goeltzenleuchter <courtneygo@google.com>