Run dmsaa on all supported Mac and SwiftShader bots

Bug: skia:11396
Change-Id: I02b733d348c0e1fafb3d05eb14d06d15faf86b07
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/429057
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
2 files changed