Prior to rendering a node, check the filter presentation attribute and
create a new canvas layer with a corresponding SkImageFilter set.
Also added the computation of the filter effect region and added a naive
(and incomplete) construction of the image filter DAG for a
<filter> element.
Bug: skia:10841
Change-Id: Ie94299757e059c39540ad316cddf438df5726d97
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/330619
Commit-Queue: Tyler Denniston <tdenniston@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
b5e29be9c4