Reland "Remove GrContext"

This reverts commit 3172208ad0dc7c29f07d907fc050f1d69fc4980e.

Reason for revert: Fixed issues

Original change's description:
> Revert "Remove GrContext"
>
> This reverts commit 2edf18d818708509809f4be17a2f5abd6d93af2b.
>
> Reason for revert: breaking wasm-debugger
>
> Original change's description:
> > Remove GrContext
> >
> > Woo!
> >
> > Change-Id: Ifa3ff7e79c7048c2f1d808cc9705593d72886f08
> > Reviewed-on: https://skia-review.googlesource.com/c/skia/+/326436
> > Auto-Submit: Adlai Holler <adlai@google.com>
> > Reviewed-by: Robert Phillips <robertphillips@google.com>
> > Reviewed-by: Brian Salomon <bsalomon@google.com>
> > Commit-Queue: Robert Phillips <robertphillips@google.com>
> > Commit-Queue: Brian Salomon <bsalomon@google.com>
>
> TBR=bsalomon@google.com,robertphillips@google.com,adlai@google.com
>
> Change-Id: Ie05bda5dad7fb5d369ebe579d2e009fdb99c0729
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/326941
> Reviewed-by: Robert Phillips <robertphillips@google.com>
> Commit-Queue: Robert Phillips <robertphillips@google.com>

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

Change-Id: I141a473439a2b444aac1944e434e8b48d9fda428
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/327217
Commit-Queue: Adlai Holler <adlai@google.com>
Reviewed-by: Adlai Holler <adlai@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
4 files changed