apps: Add support for processing brillo logs

Add support for processing brillo logs.  Brillo logs are similar to
ChromeOS netlogs with the exception of the log line timestamp, section
markers and some minor formatting in individual lines.

BUG=b:25672573
TEST=manually tested and ran grunt test

Change-Id: Ief291e73be3eb6c077f5a8bddd0fce4fff147d73
5 files changed