This prevents the programmer from accidentally adding LOG_START and LOG_END events to the log without actually starting the log. This also makes it easier to ensure that the LOG_START event always ends up first and the LOG_END event always ends up last in the log file.
Bug: webrtc:8111
Change-Id: I4e6c9306f8559ff184b5185f8728409f8dcebfa0
Reviewed-on: https://webrtc-review.googlesource.com/34400
Reviewed-by: Elad Alon <eladalon@webrtc.org>
Commit-Queue: Björn Terelius <terelius@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21486}
8e126fca47