[skottie] Ensure static split-position properties are committed

We currently drop static split-position adapters without commiting the
value to the scene graph.

TBR=
Change-Id: Id5852da35345fa58ecaf6c752456ecb32e5b405a
Reviewed-on: https://skia-review.googlesource.com/136782
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Florin Malita <fmalita@chromium.org>
1 file changed