Reland "Add compressed data support for SkImage."

This is a reland of 57263c2e0ccddf4dd62814c427a39d9d615acbe5

Original change's description:
> Add compressed data support for SkImage.
> 
> Adds a new SkImage::MakeFromCompressed method which takes raw data,
> a size, and a compression method, and returns a GPU-backed
> image.
> 
> Bug: skia:8684
> Change-Id: I570c9dafce283bcd64dfbef4fbe1c4bfeac6ce2a
> Reviewed-on: https://skia-review.googlesource.com/c/184484
> Commit-Queue: Jim Van Verth <jvanverth@google.com>
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Reviewed-by: Robert Phillips <robertphillips@google.com>

Bug: skia:8684
Change-Id: I25fb320e8cc05e1c5afa6faa81e1a55ffd83a7a3
Reviewed-on: https://skia-review.googlesource.com/c/185200
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>
6 files changed