One of the conveniences of using a Chromecast or a Cast-enabled speaker or TV is the ability to control playback from any device in the house (if you want). Starting a song from your phone and stopping it from your tablet, or asking your partner or roommate to do so while you're wrist-deep into a new banana bread recipe, are possible because of the casting notification that surfaces on all devices connected to the same network. That notification is getting a small but awesome quality-of-life improvement now thanks to new track controls.