Today the bluetooth UI (both chrome://settings and system tray) is not very robust due to a lack of proper "model layer". The UI currently talks directly to the low-level /device/bluetooth interface. This forces the UI to do the complicated job of other businesses, e.g. setting user pref and presenting an "in progress" state. This project involves creating that medium-level interface that chrome://settings and system tray will talk to instead of the low-level /device/bluetooth interface.