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
)