fix(JitsiTrack) Add setSourceName/getSourceName methods to JitsiTrack class.

modules/RTC/JitsiRemoteTrack.js

      * Update the properties when the track is remapped to another source.
      *
      * @param {string} owner The endpoint ID of the new owner.
-     * @param {string} name The new source name.
      */
-    setNewSource(owner, name) {
+    setOwner(owner) {
         this.ownerEndpointId = owner;
-        this._sourceName = name;
         this.emit(JitsiTrackEvents.TRACK_OWNER_CHANGED, owner);
     }
 
+    /**
+     * Sets the name of the source associated with the remtoe track.
+     *
+     * @param {string} name - The source name to be associated with the track.
+     */
+    setSourceName(name) {
+        this._sourceName = name;
+    }
+
     /**
      * Changes the video type of the track.
      *

modules/RTC/JitsiTrack.js

         return this.stream;
     }
 
+    /**
+     * Returns the source name of the track.
+     * @returns {String|undefined}
+     */
+    getSourceName() { // eslint-disable-line no-unused-vars
+        // Should be defined by the classes that are extending JitsiTrack
+    }
+
     /**
      * Returns the ID of the underlying WebRTC Media Stream(if any)
      * @returns {String|null}
                         audioOutputDeviceId);
                 }));
     }
+
+    /**
+     * Assigns the source name to a track.
+     * @param {String} name - The name to be assigned to the track.
+     * @returns {void}
+     */
+    setSourceName(name) { // eslint-disable-line no-unused-vars
+        // Should be defined by the classes that are extending JitsiTrack
+    }
 }

modules/xmpp/JingleSessionPC.js

                         track._setVideoType('desktop');
                     }
 
-                    track.setNewSource(s.owner, s.source);
+                    track.setSourceName(s.source);
+                    track.setOwner(s.owner);
                 } else {
                     logger.error(`Remapped SSRC ${s.ssrc} not found`);
                 }