Revert "Move op memory storage to GrContext"

This reverts commit c8cee446bf9c07da8848bbd032abf26e79966ac1.

Reason for revert: TSAN issues

Original change's description:
> Move op memory storage to GrContext
> 
> TBR=bsalomon@google.com
> Change-Id: Ifa95bf0073b9d948f2c937d10088b7734b971f90
> Reviewed-on: https://skia-review.googlesource.com/131500
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Reviewed-by: Greg Daniel <egdaniel@google.com>
> Commit-Queue: Robert Phillips <robertphillips@google.com>

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

Change-Id: Ia0d2b7408314d9b67d57388315376bbea23d3780
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/135181
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
40 files changed