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Makes the Skia Gold version of the GPU pixel tests non-experimental, so
any unsuppressed failures will show up as builder-level failures since
the tests have been quite stable.

Documentation on Gold and how to triage any new images the tests produce
can be found at
https://chromium.googlesource.com/chromium/src/+/HEAD/docs/gpu/gpu_pixel_testing_with_gold.md

Bug: 850107
Change-Id: Ic7187f049f98bad561d8591e04354359fe64e4f3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1698644Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#677067}