void addKey(String keySystem, Uint8List key, [Uint8List initData, String sessionId])

Source

void addKey(String keySystem, Uint8List key, [Uint8List initData, String sessionId]) {
  if (initData != null) {
    _blink.BlinkHTMLMediaElement.instance.webkitAddKey_Callback_4_(unwrap_jso(this), keySystem, unwrap_jso(key), unwrap_jso(initData), sessionId);
    return;
  }
  _blink.BlinkHTMLMediaElement.instance.webkitAddKey_Callback_2_(unwrap_jso(this), keySystem, unwrap_jso(key));
  return;
}