GrCullTest quickly determines whether a set of points will be visible
or not. It will be used to guard against exponential recursion when
chopping paths at an extreme zoom level.
Bug: skia:10419
Change-Id: I85183826d820bbca0349a1e794b0696f776b134b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/407297
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Herb Derby <herb@google.com>
