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This is a reland of
https://chromium-review.googlesource.com/c/chromium/src/+/1804786.
The difference is that we don't check thread priority in
angle_deqp_tests_main, as these tests do change thread priority
on purpose.

This CL verifies that the thread priority is normal when a test process
is launched and before/after each test. The goal is to avoid having
tests that assume they run at normal priority be disabled because of
other misbehaving tests (e.g. https://crbug.com/931706).

TBR=sky@chromium.org,michaelpg@chromium.org,thakis@chromium.org,eseckler@chromium.org

Bug: 931706
Change-Id: I92a827d014278b1f5b3504f48c2441ad2e83bc65
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1865405Reviewed-by: Eric Seckler <eseckler@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Commit-Queue: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708194}