Add Chrome extension for local /var/log/messages analysis

[hikalium]

On ChromeOS, file:///var/log/messages is accessible even on a production image with non-dev mode via Chrome. However, it is just shown as a plain text so it's a bit hard to parse it with eyes. Adding a Chrome extension may help debugging things and highlight anomalies. (It can just be an unpacked Chrome extension).

[hikalium]

Random ideas for the features:

• filter log messages
• annotate log messages with additional info (e.g. pop-up chromiumos-specific terminologies, level of suspicious)
• extract key information from the log (e.g. kernel versions, important event timestamps like boot, suspend/resume)