Create VectorExpressionAnimator

Change-Id: I9ac04e316fd5cc21f9400ff56cf6bc6db77ca046
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/444871
Commit-Queue: Avinash Parchuri <aparchur@google.com>
Reviewed-by: Avinash Parchuri <aparchur@google.com>
Reviewed-by: Florin Malita <fmalita@google.com>
3 files changed