Revert "Revert "Revert "Add private grpixelconfigs for alpha_8 and alpha_half"""

This reverts commit b5fb7cf0163ccb939f90ecf53ef70732c01f23ae.

Reason for revert: breaking more devices

Original change's description:
> Revert "Revert "Add private grpixelconfigs for alpha_8 and alpha_half""
> 
> This reverts commit 0fb6db4be6e30777cc5c87f1b601e8c4aacff2b1.
> 
> Reason for revert: fixed bug
> 
> Original change's description:
> > Revert "Add private grpixelconfigs for alpha_8 and alpha_half"
> >
> > This reverts commit 33d17cbb003975fff895954435183756f9893c17.
> >
> > Reason for revert: broke intel bots
> >
> > Original change's description:
> > > Add private grpixelconfigs for alpha_8 and alpha_half
> > >
> > > Bug: skia:
> > > Change-Id: I5191b6e045aea2a5af2b305b5972ad1e638a7ace
> > > Reviewed-on: https://skia-review.googlesource.com/71763
> > > Reviewed-by: Brian Salomon <bsalomon@google.com>
> > > Commit-Queue: Greg Daniel <egdaniel@google.com>
> >
> > TBR=egdaniel@google.com,bsalomon@google.com
> >
> > Change-Id: I6fff9241f7878f1ec7fad2663df9922c9cd8f628
> > No-Presubmit: true
> > No-Tree-Checks: true
> > No-Try: true
> > Bug: skia:
> > Reviewed-on: https://skia-review.googlesource.com/72180
> > Reviewed-by: Greg Daniel <egdaniel@google.com>
> > Commit-Queue: Greg Daniel <egdaniel@google.com>
> 
> TBR=egdaniel@google.com,bsalomon@google.com
> 
> Change-Id: Ie028961ecbf5934c53cb859e019e548935b3af79
> Reviewed-on: https://skia-review.googlesource.com/72241
> Commit-Queue: Greg Daniel <egdaniel@google.com>
> Reviewed-by: Greg Daniel <egdaniel@google.com>

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

Change-Id: Ieaac3eca2fc4919699c7de61a3c33348e92a7da0
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/72660
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
14 files changed