Reland "Add tooling support for dmsaa"

Reland 188443be8d18b270a9f5810448d667e6ba009cb0 without the DMSAA bots
to ensure nothing else changes.

Original change's description:
> Add tooling support for dmsaa
>
> Adds a "fAlwaysAntiAlias" flag to GrContextOptions that can be set from
> tooling code. When dmsaa is set, SkGpuDevice draws everything
> antialiased. Adds new "gldmsaa" and "glesdmsaa" configs and creates bots
> to run them.
>
> Bug: skia:11396
> Change-Id: I165e89434b733f7b02312cea0e6649812528083b
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/384936
> Commit-Queue: Chris Dalton <csmartdalton@google.com>
> Reviewed-by: Brian Salomon <bsalomon@google.com>

TBR=bsalomon@google.com

Bug: skia:11396
Change-Id: Icb45097e0a34543dc577fa32f19a692e90643a35
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/386338
Reviewed-by: Chris Dalton <csmartdalton@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
14 files changed