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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).

Bug: 931706
Change-Id: I5ca18b87720b5305285be481f7b60ff5c941a324
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1804786
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Auto-Submit: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697261}