ES and ANGLE don't support framebuffer blits from single to
multisample. On these platforms we now perform a draw instead.
Bug: skia:12069
Bug: angleproject:6030
Change-Id: Ida0a5e9b556c4715fa63cb98aba185e64c72b28e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/415767
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
