Function webkit2gtk_webextension_sys::webkit_dom_css_style_sheet_add_rule

pub unsafe extern "C" fn webkit_dom_css_style_sheet_add_rule(
    self_: *mut WebKitDOMCSSStyleSheet, 
    selector: *const c_char, 
    style: *const c_char, 
    index: c_ulong, 
    error: *mut *mut GError
) -> c_long