Fixed physical shading example controls include.

examples/webgl_shading_physical.html

@@ -51,6 +51,8 @@
 		<script src="js/postprocessing/MaskPass.js"></script>
 		<script src="js/postprocessing/SavePass.js"></script>
 
+		<script src="js/controls/TrackballControls.js"></script>
+
 
 		<script src="js/Detector.js"></script>
 		<script src="js/libs/stats.min.js"></script>