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Previously, we checked that at least 1 renderer exists and that all
renderers are being profiled. This recently started causing the tests to
flake. I suspect this is related to warm-up/spare renderers. So instead,
we check that at least 1 renderer exists and is being profiled.

Bug: 835826, 833590
Change-Id: I45ef8e1ad9ba1689ae3f0292ab80306b9d7a731f
Reviewed-on: https://chromium-review.googlesource.com/1023716Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553164}