Expose RTPReceiver for getting track statistics. (#162)

lib/src/track/remote/audio.dart

@@ -12,17 +12,16 @@ import '../web/_audio_api.dart' if (dart.library.html) '../web/_audio_html.dart'
 class RemoteAudioTrack extends RemoteTrack
     with AudioTrack, RemoteAudioManagementMixin {
   //
-  RemoteAudioTrack(
-    String name,
-    TrackSource source,
-    rtc.MediaStream stream,
-    rtc.MediaStreamTrack track,
-  ) : super(
+  RemoteAudioTrack(String name, TrackSource source, rtc.MediaStream stream,
+      rtc.MediaStreamTrack track,
+      {rtc.RTCRtpReceiver? receiver})
+      : super(
           name,
           lk_models.TrackType.AUDIO,
           source,
           stream,
           track,
+          receiver: receiver,
         );
 
   @override

lib/src/track/remote/remote.dart

@@ -5,18 +5,16 @@ import '../../types/other.dart';
 import '../track.dart';
 
 abstract class RemoteTrack extends Track {
-  RemoteTrack(
-    String name,
-    lk_models.TrackType kind,
-    TrackSource source,
-    rtc.MediaStream stream,
-    rtc.MediaStreamTrack track,
-  ) : super(
+  RemoteTrack(String name, lk_models.TrackType kind, TrackSource source,
+      rtc.MediaStream stream, rtc.MediaStreamTrack track,
+      {rtc.RTCRtpReceiver? receiver})
+      : super(
           name,
           kind,
           source,
           stream,
           track,
+          receiver: receiver,
         );
 
   @override

lib/src/track/remote/video.dart

@@ -7,16 +7,15 @@ import 'remote.dart';
 
 class RemoteVideoTrack extends RemoteTrack with VideoTrack {
   //
-  RemoteVideoTrack(
-    String name,
-    TrackSource source,
-    rtc.MediaStream stream,
-    rtc.MediaStreamTrack track,
-  ) : super(
+  RemoteVideoTrack(String name, TrackSource source, rtc.MediaStream stream,
+      rtc.MediaStreamTrack track,
+      {rtc.RTCRtpReceiver? receiver})
+      : super(
           name,
           lk_models.TrackType.VIDEO,
           source,
           stream,
           track,
+          receiver: receiver,
         );
 }

lib/src/track/track.dart

@@ -45,13 +45,11 @@ abstract class Track extends DisposableChangeNotifier
 
   rtc.RTCRtpSender? get sender => transceiver?.sender;
 
-  Track(
-    this.name,
-    this.kind,
-    this.source,
-    this._mediaStream,
-    this._mediaStreamTrack,
-  ) {
+  rtc.RTCRtpReceiver? receiver;
+
+  Track(this.name, this.kind, this.source, this._mediaStream,
+      this._mediaStreamTrack,
+      {this.receiver}) {
     // Any event emitted will trigger ChangeNotifier
     events.listen((event) {
       logger.fine('[TrackEvent] $event, will notifyListeners()');