check bounds of each cubic segment against clip

Timing against complex svg image (map),
no tiling: no change or very slightly faster
tiling (4x4): went from 3x slower (than untiled) to 2x slower

no gold changes expected

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1532733002

Review URL: https://codereview.chromium.org/1532733002
2 files changed