LibWeb: Implement audio media data processing through PlaybackManager

Author: https://github.com/Zaggy1024
Commit: 5456072d48
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/6410
Reviewed-by: https://github.com/R-Goc
Reviewed-by: https://github.com/gmta ✅

Libraries/LibWeb/HTML/HTMLMediaElement.h

@@ -130,6 +130,8 @@ public:
     GC::Ref<VideoTrackList> video_tracks() const { return *m_video_tracks; }
     GC::Ref<TextTrackList> text_tracks() const { return *m_text_tracks; }
 
+    void set_audio_track_enabled(Badge<AudioTrack>, GC::Ptr<HTML::AudioTrack> audio_track, bool);
+
     void set_selected_video_track(Badge<VideoTrack>, GC::Ptr<HTML::VideoTrack> video_track);
 
     void update_video_frame_and_timeline();