Function webkit2gtk_sys::webkit_web_view_can_execute_editing_command

pub unsafe extern "C" fn webkit_web_view_can_execute_editing_command(
    web_view: *mut WebKitWebView, 
    command: *const c_char, 
    cancellable: *mut GCancellable, 
    callback: GAsyncReadyCallback, 
    user_data: gpointer
)