Revert "Make SkImage_Gpu be deferred"

This reverts commit 0db235bc0278887c344eb25b4681e9cca4cf892a.

Reason for revert: cc_unittests failing

Original change's description:
> Make SkImage_Gpu be deferred
> 
> This CL removes the GrTexture-based ctor forcing everyone to create deferred SkImage_Gpus.
> 
> split out into:
> https://skia-review.googlesource.com/c/9106/ (Remove atlas creation from GrResourceProvider)
> 
> Change-Id: I266bbe089c242fe54d5b7adcc7895aa5a39440a0
> Reviewed-on: https://skia-review.googlesource.com/6680
> Commit-Queue: Robert Phillips <robertphillips@google.com>
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> 

TBR=bsalomon@google.com,robertphillips@google.com,reviews@skia.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Change-Id: Ia15590a1fae04b52723713760fdbf0492ad36286
Reviewed-on: https://skia-review.googlesource.com/9962
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
15 files changed