fennec + electrolysis + mochitests

As a note I am working on getting f10s running mochitests.  Since
mochitest relies heavily on elevated privileges, there is some
plumbing work that is required.  My plans are to use the
messageManager apis to send requests to chrome for all the time I need
elevated privileges.

Currently, it seems that this functionality is broken in Fennec.  I
have filed bug 565924 to track this:
https://bugzilla.mozilla.org/show_bug.cgi?id=565924

If anybody else has worked on this or has ideas and examples for
content<->chrome communication, let me know.