Reduce dependence on GrSurface's origin field (take 2)

TBR=bsalomon@google.com
Change-Id: Ia238fc66b0fe10a3626c7967b2ac1f1a4bf4cd71
Reviewed-on: https://skia-review.googlesource.com/25800
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
29 files changed