[skottie] Initial animated text properties support

Limitations:

  - no range selectors (applies to the whole text)
  - only position, fill color and stroke color for now

Change-Id: I91e88a6107c5f66687c1c27f27a71be3914bde25
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/217386
Commit-Queue: Florin Malita <fmalita@chromium.org>
Reviewed-by: Ben Wagner <bungeman@google.com>
1 file changed