e784d2c507
The player may suppress playback when waiting for audio focus even if the state==Player.READY. There is currently no getter or callback to obtain this piece of information for UI updates or analytics. Also, it's a important derived state to know whether the playback position is advancing. Add isPlaying and the corresponding callback to allow retrieving this information more easily. Issue:#6203 PiperOrigin-RevId: 268921721