Simulcast and some statistics.
The subscriber can choose the simulcast profile to use (high, medium, low), and the publisher and subscriber each show resolution and bandwidth usage.
Because the example uses H264, the simulcast options will only be available when the producer supports H264 simulcast. Currently, no released browsers do, but the option exists in libwebrtc behind a Field Trial:
// Enable H264 Simulcast field trial.
webrtc::field_trial::InitFieldTrialsFromString("WebRTC-H264Simulcast/Enabled/");
Have fun!
Michael.