Make DefaultPathOp a non-legacy GrMeshDrawOp

Change-Id: I9abc795e7c3aca7c129faee48190be749c6dc159
Reviewed-on: https://skia-review.googlesource.com/23101
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
2 files changed