Make MSAAPathOp a non-legacy GrMeshDrawOp

Change-Id: Ibe1626a3ebecad0ccc51505c670f9a3ee98d5209
Reviewed-on: https://skia-review.googlesource.com/22361
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
1 file changed