[canvaskit] Expose getShadowLocalBounds

Bug: skia:11146
Change-Id: Ib08a96c8d0ca0f4ca2b489b3793e45f642cb231f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/353034
Reviewed-by: Yegor Jbanov <yjbanov@google.com>
Reviewed-by: Jim Van Verth <jvanverth@google.com>
7 files changed