void QGraphicsWebViewPrivate::update(const QRect & dirtyRect)
{
    q->update(QRectF(dirtyRect));

    createOrDeleteOverlay();
    if (overlay)
        overlay->update(QRectF(dirtyRect));
#if USE(ACCELERATED_COMPOSITING)
    updateCompositingScrollPosition();
    syncLayers();
#endif
}
void QGraphicsWebViewPrivate::update(const QRect & dirtyRect)
{
    q->update(QRectF(dirtyRect));
}