Reland "Add GrContext api to update compressed backend textures."

This reverts commit ceebe424b1475ebdcf55f769e58b5e1a45b272c9.

Reason for revert: relanding with fix

Original change's description:
> Revert "Add GrContext api to update compressed backend textures."
> 
> This reverts commit 2c180304dc239a44770df7bf2649f3138f25922c.
> 
> Reason for revert: attempted workaround did not fix techno spark so needs further investigation
> 
> Original change's description:
> > Add GrContext api to update compressed backend textures.
> > 
> > Bug: chromium:1099255
> > Change-Id: I0c3f25ddb037e47e3b910fa89c3d8b3aa27b3114
> > Reviewed-on: https://skia-review.googlesource.com/c/skia/+/302265
> > Reviewed-by: Brian Salomon <bsalomon@google.com>
> > Reviewed-by: Robert Phillips <robertphillips@google.com>
> > Commit-Queue: Greg Daniel <egdaniel@google.com>
> 
> TBR=egdaniel@google.com,bsalomon@google.com,robertphillips@google.com
> 
> Change-Id: Ib5433def02dc5dad97dcdbd4476ced6de2361e6a
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: chromium:1099255
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/302576
> Reviewed-by: Greg Daniel <egdaniel@google.com>
> Commit-Queue: Greg Daniel <egdaniel@google.com>

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

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: chromium:1099255
Change-Id: Ie238a56b7f12fea8b6e251a050e5e2f4b20d2ede
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/304741
Reviewed-by: Greg Daniel <egdaniel@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
7 files changed