Fail the "tess_segs_5" tests if Skia doesn't actually give us 5 tessellation segments

Bug: skia:10419
Change-Id: I5363ac6ac74131341d010cf2958cc5d7a070689f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/318782
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
2 files changed