[skottie] Fix precomp time remapping vs time start/stretch interaction

In the presence of time remapping, time start/stretch values appear to
be ignored.

TBR=
Change-Id: I6a4dcc107f2d0fc6361f91ba4f4643e33da37d93
Reviewed-on: https://skia-review.googlesource.com/149701
Commit-Queue: Florin Malita <fmalita@chromium.org>
Reviewed-by: Florin Malita <fmalita@chromium.org>
1 file changed