Create GrTextureOpList to support deferred copy batches for textures

BUG=skia:

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=3967

Change-Id: I63b926f63294795f999a130c0ceead87fbaf978d
Reviewed-on: https://skia-review.googlesource.com/3967
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
7 files changed