[skottie] Range selector cleanup pass

Generalize the partial coverage logic to handle all three cases (left
edge, right edge, both edges), and remove the single-index
branch.

Also add some docs.

TBR=bungeman
Change-Id: I90af708f053d6d3eff154fc1309a5c1269a7eaed
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/219518
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Florin Malita <fmalita@chromium.org>
1 file changed