Rename testingOnly_drawBatch to testingOnly_addDrawOp and sk_sp

Change-Id: I35efd4ad2b7132145c1e477f0b1f283276e9fad5
Reviewed-on: https://skia-review.googlesource.com/5704
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
11 files changed