Summary: There's no existing API on the Flipper objects to get an arbitrary Java object, which we need in an inspector plugin we're building (`getDynamic` requires you to know what you want in the end).
Reviewed By: jknoxville
Differential Revision: D21223329
fbshipit-source-id: 29e9f8788be404cec44c6ddeb6b56b939b97b766