[skottie] Layer clip support

TBR=

Change-Id: Ibf65efc69031f8f6e19f4f28cccab29c357e704d
Reviewed-on: https://skia-review.googlesource.com/101540
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Florin Malita <fmalita@chromium.org>
diff --git a/experimental/sksg/geometry/SkSGTrimEffect.h b/experimental/sksg/geometry/SkSGTrimEffect.h
index 77da3ab..860cfaf 100644
--- a/experimental/sksg/geometry/SkSGTrimEffect.h
+++ b/experimental/sksg/geometry/SkSGTrimEffect.h
@@ -33,6 +33,7 @@
     SG_ATTRIBUTE(Offset, SkScalar, fOffset)
 
 protected:
+    void onClip(SkCanvas*, bool antiAlias) const override;
     void onDraw(SkCanvas*, const SkPaint&) const override;
 
     SkRect onRevalidate(InvalidationController*, const SkMatrix&) override;