bool hasDomName(DeclarationMirror mirror)

Source 

bool hasDomName(mirrors.DeclarationMirror mirror) {
  var location = mirror.location;
  if (location == null || location.sourceUri.scheme != 'dart') return false;
  for (var annotation in mirror.metadata) {
    if (mirrors.MirrorSystem.getName(annotation.type.simpleName) == "DomName") {
      // We can't make sure the annotation is in dart: as Dartium believes it
      // is file://dart/sdk/lib/html/html_common/metadata.dart
      // instead of a proper dart: location.
      return true;
    }
  }
  return false;
}