ccpr: Convert GrCCDrawPathsOp::SingleDraw to a class

Just some cleanup.

Bug: skia:8462
Change-Id: Iad1d3111690c1db1c36a495b4badbe9edd4b5555
Reviewed-on: https://skia-review.googlesource.com/c/180740
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
2 files changed