[sksg] Fix paint inval

Paint nodes contribute to invalidation.  Hoist the inval logic from
geometry nodes to draw nodes.

TBR=
Change-Id: Iab33086c377ef4940a84dae3cdccb2c9bdbee99c
Reviewed-on: https://skia-review.googlesource.com/89901
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Florin Malita <fmalita@chromium.org>
6 files changed