Initial commit

lib/js/media_metadata.dart

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+@JS()
+library media_metadata;
+
+import 'package:js/js.dart';
+
+@JS('MediaMetadata')
+class MediaMetadata {
+  external MediaMetadata(MetadataLiteral md);
+}
+
+@JS()
+@anonymous
+class MetadataLiteral {
+  external String get title;
+  external String get album;
+  external String get artist;
+  external List<MetadataArtwork> get artwork;
+  external factory MetadataLiteral(
+      {String title,
+      String album,
+      String artist,
+      List<MetadataArtwork> artwork});
+}
+
+@JS()
+@anonymous
+class MetadataArtwork {
+  external String get src;
+  external String get sizes;
+  external String get type;
+  external factory MetadataArtwork({String src, String sizes, String type});
+}

lib/js/media_session_web.dart

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+@JS('navigator.mediaSession')
+library media_session_web;
+
+import 'package:js/js.dart';
+import 'media_metadata.dart';
+
+@JS('setActionHandler')
+external void setActionHandler(String action, Function(ActionResult) callback);
+
+@JS('setPositionState')
+external void setPositionState(PositionState state);
+
+@JS()
+@anonymous
+class ActionResult {
+  external String get action;
+  external double get seekTime;
+
+  external factory ActionResult({String action, double seekTime});
+}
+
+@JS()
+@anonymous
+class PositionState {
+  external double get duration;
+  external double get playbackRate;
+  external double get position;
+  external factory PositionState({
+    double duration,
+    double playbackRate,
+    double position,
+  });
+}
+
+@JS('metadata')
+external set metadata(MediaMetadata metadata);