Reduce dependence on GrSurface's origin field (take 3)

TBR=bsalomon@google.com

Change-Id: I8c95c6774897dbd87e3c5c87d92f75c5b64d4e76
Reviewed-on: https://skia-review.googlesource.com/26424
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
30 files changed