Reland "Migrate metal tools away from GrContext"

This reverts commit 18f4b1c7e31a3543159fb0e6f9dd08521a3337d7.

Reason for revert: Fixed iOS

Original change's description:
> Revert "Migrate metal tools away from GrContext"
>
> This reverts commit 3eb813e0cc134767a10e9efd4811fc519eccb280.
>
> Reason for revert: Broke iOS
>
> Original change's description:
> > Migrate metal tools away from GrContext
> >
> > Change-Id: I73a73ca5d088c35acd23be3336d8d1e3e859a82e
> > Reviewed-on: https://skia-review.googlesource.com/c/skia/+/318760
> > Commit-Queue: Brian Salomon <bsalomon@google.com>
> > Auto-Submit: Adlai Holler <adlai@google.com>
> > Reviewed-by: Brian Salomon <bsalomon@google.com>
>
> TBR=bsalomon@google.com,robertphillips@google.com,adlai@google.com
>
> Change-Id: Idf74c936cfe8481e18455dcc0faa21155884b198
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/319017
> Reviewed-by: Adlai Holler <adlai@google.com>
> Commit-Queue: Adlai Holler <adlai@google.com>

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


Change-Id: I6e14a333be4a960af0434bbcb6ce9a1a2271dca6
Cq-Include-Trybots: luci.skia.skia.primary:Build-Mac-Clang-arm64-Debug-iOS_Metal,Test-iOS-Clang-iPhone11-GPU-AppleA13-arm64-Debug-All-Metal,Test-Mac10.13-Clang-MacBook10.1-GPU-IntelHD615-x86_64-Debug-All-Metal,Test-Mac10.13-Clang-MacBook10.1-GPU-IntelHD615-x86_64-Debug-All-DDL3_Metal
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/319018
Commit-Queue: Adlai Holler <adlai@google.com>
Reviewed-by: Adlai Holler <adlai@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
7 files changed