fix pathops fuzz

add escape hatch to abort infinite loop
when fed fuzzed data

R=kjlubick@google.com

Docs-Preview: https://skia.org/?cl=172745
Bug: 907844
Change-Id: I015fa1f6f8b697ad438e3d17c4254b65511d699e
Reviewed-on: https://skia-review.googlesource.com/c/172745
Commit-Queue: Cary Clark <caryclark@skia.org>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
Auto-Submit: Cary Clark <caryclark@skia.org>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
1 file changed