allow GMs to fail in DM

And mark atlastext as GPU-only, so it's skipped instead
of running and failing on non-GPU --configs.

Change-Id: I9b41873bed14e20f2e086a04f57b247994e9266e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/205347
Commit-Queue: Mike Klein <mtklein@google.com>
Auto-Submit: Mike Klein <mtklein@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
3 files changed