remove scaling from pathops

PathOps added a cheat some time ago to reduce
fuzzer bugs by scaling down very large paths,
with the hope that it would make the math more
sane.

This had the side-effect of causing small edges
to disappear altogether if the bounds is large
enough.

Removing the scaling causes a single regression to
one fuzz-generated bug. That path succeeeded with
scale by eliminating the troublesome tiny contour.

Eliminating the scale may fix the CCPR-related bug
discovered by Flutter, or at least uncover the next
bug.

I would expect more fuzzer bugs to appear with
this change; paths with large and small values will
no longer have the small values removed.

R=csmartdalton@google.com,reed@google.com,bsalomon@google.com

Bug: skia:8290
Change-Id: I3bfdb101c568e9cfa324858685eac1f9c368c291
Reviewed-on: https://skia-review.googlesource.com/150465
Commit-Queue: Cary Clark <caryclark@skia.org>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
12 files changed