Fix Surface::resolveMSAA for non msaa surfaces.

Bug: chromium:1292418
Change-Id: I48dc15fa43b4f3c12e5ca87f1665b2da85d93ddf
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/504697
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
2 files changed