Make GrRenderTargetContext::addDrawOp use sk_sp

Change-Id: Iff7f63635cdbc5cc51e5968a565f2fde2be3acb0
Reviewed-on: https://skia-review.googlesource.com/5932
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
16 files changed