Re-land: Stop using fixed point recs for gradient positioning info

The fixed point gradient records are historical relics.  Instead of
round-tripping through FP, just use the float positions directly.

We can remove the recs completely in a follow-up.

TBR=
Change-Id: Ic3c8e58af6dfa76744799513c9e60af0462014d0
Reviewed-on: https://skia-review.googlesource.com/64680
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Florin Malita <fmalita@chromium.org>
2 files changed