Creates a texture that contains the contents of pixmap.
 If automatic_updates is true then Cogl will attempt to listen for damage 
            events on the pixmap and automatically update the texture when it changes.
| context | A Context | 
| pixmap | A X11 pixmap ID | 
| automatic_updates | Whether to automatically copy the contents of the pixmap to the texture. | 
| a new TexturePixmapX11 instance |