The --trace_event=file.json option allows to log events,
for further inspection in chromium event viewer.
Previous handling of this option was broken,
closing the logger before the tests were even run.
Bug: webrtc:10926
Change-Id: I9123d12666b5f254feeaef685def96eb8ba1c7f8
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/167720
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Artem Titov <titovartem@webrtc.org>
Commit-Queue: Yves Gerey <yvesg@google.com>
Cr-Commit-Position: refs/heads/master@{#30401}
071d025929