[SkottieView] handle calls to setSource after first animation initialization

Change-Id: I8fdb9142e1dd67f9418f8a5fc13518a2c2c11566
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/355662
Reviewed-by: Tyler Freeman <fuego@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Jorge Betancourt <jmbetancourt@google.com>
2 files changed