Reland "Removed made-up kSBGRA pixel config."

This reverts commit 70aae53d57b68b17707dafe732cb601e78f3444c.

Reason for revert: Relanding with fix

Original change's description:
> Revert "Removed made-up kSBGRA pixel config."
>
> This reverts commit ff95f6ca9dbf3d5a7155a38c0a9e4a27edbfaaed.
>
> Reason for revert: Broke command buffer GLBackendAllocationTest??
>
> Original change's description:
> > Removed made-up kSBGRA pixel config.
> >
> > We made up this pixel config and don't actually use it ourselves so lets
> > kill it for simplicity.
> >
> > Change-Id: I6ae1c78fe7ada336a2411d295e8836dfeecb2d5c
> > Reviewed-on: https://skia-review.googlesource.com/c/skia/+/223979
> > Reviewed-by: Robert Phillips <robertphillips@google.com>
> > Commit-Queue: Greg Daniel <egdaniel@google.com>
>
> TBR=egdaniel@google.com,robertphillips@google.com,brianosman@google.com
>
> Change-Id: I62e954495a702c7ad050719d8a1d6c4abcea3f60
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/223990
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Commit-Queue: Brian Salomon <bsalomon@google.com>

TBR=egdaniel@google.com,bsalomon@google.com,robertphillips@google.com,brianosman@google.com

Change-Id: If8781567f065031c46bcea74098d32ed1bc72607
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/223994
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
19 files changed