Rename GrTessellatingStencilFillOp -> GrPathStencilFillOp

This makes the class name conform to the same pattern as the other
tessellation ops: stroke tessellation ops begin with GrStroke* and
fill tessellation ops now begin with GrPath*.

Change-Id: I454341ec95438637ee2a4e501a374f8f59622550
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/405018
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
5 files changed