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: I943f1c754669391f55e46471781fa65840629377
Reviewed-on: https://skia-review.googlesource.com/22205
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Yuqian Li <liyuqian@google.com>
1 file changed