class ChromeMediaGalleries extends ChromeApi {
 static final JsObject _mediaGalleries = chrome['mediaGalleries'];

 ChromeMediaGalleries._();

 bool get available => _mediaGalleries != null;

 /**
  * Get the media galleries configured in this user agent. If none are
  * configured or available, the callback will receive an empty array.
  */
 Future<List<FileSystem>> getMediaFileSystems([MediaFileSystemsDetails details]) {
   if (_mediaGalleries == null) _throwNotAvailable();

   var completer = new ChromeCompleter<List<FileSystem>>.oneArg((e) => listify(e, _createDOMFileSystem));
   _mediaGalleries.callMethod('getMediaFileSystems', [jsify(details), completer.callback]);
   return completer.future;
 }

 /**
  * Get metadata about a specific media file system.
  */
 MediaFileSystemMetadata getMediaFileSystemMetadata(FileSystem mediaFileSystem) {
   if (_mediaGalleries == null) _throwNotAvailable();

   return _createMediaFileSystemMetadata(_mediaGalleries.callMethod('getMediaFileSystemMetadata', [jsify(mediaFileSystem)]));
 }

 void _throwNotAvailable() {
   throw new UnsupportedError("'chrome.mediaGalleries' is not available");
 }
}