1. DomName('MediaKeys.create')
  2. DocsEditable()
  3. Experimental()
Future create(String keySystem)

Source 

@DomName('MediaKeys.create')
@DocsEditable()
@Experimental() // untriaged
static Future create(String keySystem) => wrap_jso(_blink.BlinkMediaKeys.instance.create_Callback_1_(keySystem));