[skottie] Fix gradient ramp interaction with non-atomic draws

Currently, shader effects are applied via layers for non-atomic draw fragments.

This is incorrect, as shaders on layer paints are ignored.

Update to always propagate the shader to leaf node paints.

Change-Id: I59f5a5b874e87827f61844969550600fa39e22a3
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/205931
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Florin Malita <fmalita@chromium.org>
2 files changed