Berkelium doesn't provide any support for this and we don't plan to.
However, you can do this on your own, simply embedding the files
directly into the binary and extracting them alongside the your
application before trying to use Berkelium. You'd essentially be
making your program a self-extracting archive. If you're not sure how
to accomplish this, that'd be a good place to start googling.
Also, keep in mind that you need other files as well. Chromium wasn't
at all designed to work as a completely standalone program. Off the
top of my head, I recall locales, resources, and some .pak files being
necessary.
-Ewen