Use clippedIR instead of clipBounds to filter coverage deltas

Due to precision limit, some cubics may generate lines exceeding
the path's IR. Since we created delta list or delta mask using
clippedIR, it's important that we use the stricter clippedIR
instead of clipBounds to filter the coverage deltas.

Bug: oss-fuzz:6189
Change-Id: I775408282fb45ada41968426c2f32d28bb567af1
Reviewed-on: https://skia-review.googlesource.com/113160
Commit-Queue: Yuqian Li <liyuqian@google.com>
Reviewed-by: Cary Clark <caryclark@google.com>
1 file changed