void LayerTilerChromium::growLayerToContain(const IntRect& contentRect)
{
    IntRect layerRect = contentRectToLayerRect(contentRect);
    IntSize layerSize = IntSize(layerRect.maxX(), layerRect.maxY());

    IntSize newSize = layerSize.expandedTo(m_layerSize);
    resizeLayer(newSize);
}

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