Add song progress bar

controller.py

@@ -453,7 +453,13 @@ class Controller:
                         # Kept while paused, so the card does not jump about
                         # under the thumb that just pressed pause.
                         if room["play_state"] != "stop":
-                            room["now_playing"] = self._track(media)
+                            track = self._track(media)
+                            if track is not None:
+                                progress = self.heos.progress_for(self.playback_pid(key))
+                                if progress and progress["duration"]:
+                                    track["position_ms"] = progress["cur_pos"]
+                                    track["duration_ms"] = progress["duration"]
+                            room["now_playing"] = track
                     except (TargetError, HeosError, KeyError) as exc:
                         room["available"] = False
                         room["error"] = str(exc)