Clean up programInfo creation in GrMeshDrawOp-derived Ops

This CL:
  Renames the existing createProgramInfo method to onCreateProgramInfo and makes it a virtual on GrMeshDrawOp

  Moves the non-virtual createProgramInfo (helper) calls to GrMeshDrawOp

  Changes onCreateProgramInfo to not return a ProgramInfo*. This is setting up to handle ops that create >1 programInfo (e.g., AAHairlineOp)

This CL leaves the following 8 ops in need of an onCreateProgramInfo implementation:

AAHairlineOp
AAFlatteningConvexPathOp
GrAtlasTextOp
GrShadowRRectOp
SmallPathOp
GrTextureOp
PrimitiveProcessorTest::Op
VertexColorSpaceBench::Op

Bug: skia:9455
Change-Id: Id7e2b8a40cac86ede6bf3c0e544da5500ff47d8a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/276403
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
25 files changed