Reland "Use analytic AA in FillRRectOp even if the target has MSAA"

This is a reland of cad44bcdd288da81060b5ba6bd5ce6833b7e9146

Original change's description:
> Use analytic AA in FillRRectOp even if the target has MSAA
>
> Bug: skia:11396
> Change-Id: Ia29fd5c9f00006274bb2aa1db96fbad57d858786
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/380016
> Commit-Queue: Chris Dalton <csmartdalton@google.com>
> Reviewed-by: Robert Phillips <robertphillips@google.com>

Bug: skia:11396
Change-Id: I6382085ccd037b534a1ed1355c1464aaef799a44
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/380477
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
6 files changed