Renders this WebView into an offscreen render buffer and clears the
dirty state.
@return A pointer to the internal render buffer instance that was used to
render this WebView. This value may change between renders and
may return NULL if the WebView has crashed.
Renders this WebView into an offscreen render buffer and clears the dirty state.
@return A pointer to the internal render buffer instance that was used to render this WebView. This value may change between renders and may return NULL if the WebView has crashed.