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Representative perf tests have been running on chromium.gpu as
experimental. This change removes the experimental tag:

Stats of recent runs on chromium.gpu:
14 flakes in the last 920 runs (1.5% flake rate)

Bug: chromium:1000837
Change-Id: Ie6f6d85733f8b63d5cd69636976c1eab93f38250
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2081190Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Behdad Bakhshinategh <behdadb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746518}