The LOG_END time is incorrect if the event log is stopped
by the file size limit instead of a duration limit or a
manual stop. This makes the call appear to be very long
(10^13 seconds) in the analysis tool. This CL is a workaround
for that problem.
BUG=webrtc:6138
Review-Url: https://codereview.webrtc.org/2176663002
Cr-Commit-Position: refs/heads/master@{#13585}