Enable new code to fix anti-aliasing bugs in Skia

Primarily, this activates a bug fix where the coverage for
some shapes was computed incorrectly, leading to slivers
of not-enough coverage when stroking paths.

The code in question is here: http://review.skia.org/856596

Bug: b/340982297
Bug: b/341966153
Change-Id: I71848fc8f45c79f8bed85d4b7f7caf011ac6da28
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5560605


Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1312963}