Update MotionTileEffect to avoid rebuilding shaders redundantly,
at render time:
1) build all shaders at revalidation time
2) cache the layer content picture separately, and only rebuild when
the layer content changes
To support #2, add some SG helpers for querying subtree inval state.
With this change, we avoid all render time allocations.
Notry: true
Change-Id: I55a1f95752704af6a667b266e725492de6640387
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/226512
Commit-Queue: Florin Malita <fmalita@chromium.org>
Commit-Queue: Mike Reed <reed@google.com>
Auto-Submit: Florin Malita <fmalita@chromium.org>
Reviewed-by: Mike Reed <reed@google.com>
ccacfa02d2