Make GrFillRRectOp a GrMeshDrawOp

I don't know why this wasn't always a meshDrawOp. Bringing it into the fold reduces some of the boiler plate code and centralizes things.

Bug: skia:9455
Change-Id: Icd71907c3dc2ecefe4a2040293f94884678bbf45
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/278179
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
2 files changed