[skottie] Add support for fill effect opacity

Also, it turns out layer effect properties are keyed by their
index in the property array, and not by "ty".  Update the
implementation to reflect this.


Change-Id: I72c6cf83f60ee1f8240222c7e2be2d567555a772
Reviewed-on: https://skia-review.googlesource.com/c/161840
Commit-Queue: Florin Malita <fmalita@chromium.org>
Reviewed-by: Mike Reed <reed@google.com>
1 file changed