Allow GrAppliedClip to have >1 clip coverage FP

Bug: skia:7190
Change-Id: I07fc689b20968a1b9fe2620bf8a33faacf917823
Reviewed-on: https://skia-review.googlesource.com/65401
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
8 files changed