Make TessellatingPathOp be a non-legacy GrMeshDrawOp

Change-Id: Ic92fdca7bdca91eab3a87e4fea3972ffdcfd5b12
Reviewed-on: https://skia-review.googlesource.com/21867
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
2 files changed