[skottie] Split-position support

TBR=

Change-Id: I82433bc9a73f89956c2b25146e1521412d125945
Reviewed-on: https://skia-review.googlesource.com/102622
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Florin Malita <fmalita@chromium.org>
1 file changed