Use GrBackendObjectOwnership instead of GrVkImage::Wrapped

This is more in line with what GL does and will make things cleaner for
the metal backend as well.

Bug: skia:
Change-Id: I0ba0c588f813ad78051251c1cb9e8f92fd917ecc
Reviewed-on: https://skia-review.googlesource.com/35940
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
8 files changed