Function webkit2gtk_sys::webkit_web_view_get_snapshot

pub unsafe extern "C" fn webkit_web_view_get_snapshot(
    web_view: *mut WebKitWebView, 
    region: WebKitSnapshotRegion, 
    options: WebKitSnapshotOptions, 
    cancellable: *mut GCancellable, 
    callback: GAsyncReadyCallback, 
    user_data: gpointer
)