More programInfo cleanup

This CL moves the boiler-plate implementation of onPrePrepareDraws up to GrMeshDrawOp. This, unfortunately, required the addition of a 'programInfo' virtual but that may go away in the future.


The only GrMeshDrawOp-derived classes left are:
  AAHairlineOp - which has 3 programInfos
  AAFlatteningConvexPathOp - which has >=1 mesh (but just 1 programInfo)
  GrAtlasTextOp - which has inline uploads
  SmallPathOp - which, maybe, has inline uploads
  TextureOp - which has chaining

Bug: skia:9455
Change-Id: Id10f70e764054134751545ad38b99f0a0778de76
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/276642
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
25 files changed