Move ReleaseProc info to GrTexture and for implementations to define it.

Bug: skia:
Change-Id: I0dbe421ebd17ef7d21fd2f4f027d2a3bdcf04b7b
Reviewed-on: https://skia-review.googlesource.com/14031
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
13 files changed