Peter Boström 0ec9a9b9fc Lower event-tracing log-thread priority.
Lowers risk of the event-tracing thread affecting measurements (and
performance of device). Entirely speculative, but shouldn't hurt.
Timings are still done on the thread that calls the trace macros.

BUG=
R=tommi@webrtc.org

Review URL: https://codereview.webrtc.org/2013363002 .

Cr-Commit-Position: refs/heads/master@{#12943}
2016-05-27 09:11:52 +00:00
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