Change filtering in drawPatch to linear.

This is mostly just to work around bug in raster backend.

Bug: skia:11822
Change-Id: I7c5af9dca36dac3eee4948f2a127fee6d314cf55
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/391916
Auto-Submit: Mike Reed <reed@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
1 file changed