1. DomName('Navigator.registerProtocolHandler')
  2. DocsEditable()
  3. Unstable()
void registerProtocolHandler(String scheme, String url, String title)

Source 

@DomName('Navigator.registerProtocolHandler')
@DocsEditable()
@Unstable()
void registerProtocolHandler(String scheme, String url, String title) => _blink.BlinkNavigator.instance.registerProtocolHandler_Callback_3_(this, scheme, url, title);