[skottie] Simplify Parse<SkPoint>

Some BM versions wrap point values as single or even multi-element arrays.
Parse<SkScalar> already handles the former case - we can extend that
behavior to also cover the latter and simplify Parse<SkPoint>.

TBR=

Change-Id: I2152928944f43dc03a5d8f0d65865ac43974fd7a
Reviewed-on: https://skia-review.googlesource.com/135800
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Florin Malita <fmalita@chromium.org>
1 file changed