pub fn send_extension_event<'c, 'input, Conn>(
conn: &'c Conn,
destination: Window,
device_id: u8,
propagate: bool,
events: &'input [EventForSend],
classes: &'input [EventClass],
) -> Result<VoidCookie<'c, Conn>, ConnectionError>where
Conn: RequestConnection + ?Sized,