Wean SkMorphologyImageFilter off of SurfaceDrawContext_v1.h

Without the SkVx.h #include this broke the G3 roll as part of:

https://skia-review.googlesource.com/c/skia/+/431384 (Retract GrSurfaceDrawContext.h a bit)

This new version should work. This is part of making v1::SurfaceDrawContext V1-only.

Bug: skia:11837
Change-Id: I240e5feeef6de89199882e666c71a864d13b9605
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/434163
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
1 file changed