The current gobject.py works with a version of the
frame filtering code that was shipped in Fedora, but
never upstreamed.

A newer version of this feature was put into upstream gdb
recently.  It works in a somewhat different way, which should
allow some hacks to be dropped from gobject.py.  The new
approach also has some nice benefits (integrated with "bt"
and with MI and handles frame elision nicely).

The new feature is documented in upstream gdb's documentation.
The "frame decorator" and "frame filter" nodes here
http://sourceware.org/gdb/current/onlinedocs/gdb/Python-API.html#Python-API
are a good place to start.