If we're going to write an image shader, we're going to need to know the
matrix and some bits of the paint.
Instead of all possible information, I decided to pass just what the
image shader needs for now, and will pass along more as I go.
I've added a stub implementation of SkImageFilter as a way to make sure
I'm threading everything it'll need through.
Change-Id: I98de1724056dbc0902a34fc31da8ec6bdf38dc34
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/261801
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Mike Reed <reed@google.com>
4f275cfe0e