Make GrRenderTargetOpList::addDrawOp use sk_sp

Change-Id: I1b3aee2c16075bc481d96052a82f3b3da82061fe
Reviewed-on: https://skia-review.googlesource.com/5699
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
4 files changed