Always enable Analytic AA for rects

Previously, suitableForAAA disabled Analytic AA for small rects.
But that's a mistake. Re-enabling AAA will bring 10-20% speedup for small rects
(~800ns -> ~700ns measured by path_fill_small_rect nanobench).

Bug: skia:
Change-Id: I1d8bf4c105d8d116ea441a46e6c955c546bcbb22
Reviewed-on: https://skia-review.googlesource.com/22074
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Yuqian Li <liyuqian@google.com>
1 file changed