* Define "chrome" extensions to MediaStreams for privileged JS code (and B2G's) use. This includes CameraControl features (https://wiki.mozilla.org/WebAPI/CameraControl).
** CrossB2G specific (possibly eventually extended to cross-platformplatforms): {{bug|752352}} [Fabrice]
* Implement a fallback backend for MediaEngine (when hardware support not available, returnMediaStream with white noise, for example).