Revert "Disable instanced rendering on Skylake"

This reverts commit 240ea4c03a7d71dca693b8c173d99a7394112906.

Reason for revert: Too many regressions from not having CCPR

Original change's description:
> Disable instanced rendering on Skylake
> 
> We previously had a glFlush() workaround for instanced rendering on
> Skylake. However, the non-instanced approach is often faster than
> instanced + glFlush(). This CL just disables instanced rendering
> altogether on Skylake instead. The chip is old enough now that this
> seems like a reasonable solution.
> 
> Bug: skia:8566
> Change-Id: Ib82a519d8186b463b72b20203fb69d078e757aa7
> Reviewed-on: https://skia-review.googlesource.com/c/172470
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Commit-Queue: Chris Dalton <csmartdalton@google.com>

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

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

Bug: skia:8566
Change-Id: I947cdd0026b7fc31a4f75f5f416299e27dd6f56e
Reviewed-on: https://skia-review.googlesource.com/c/173128
Reviewed-by: Chris Dalton <csmartdalton@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
4 files changed