Fix implicit variable declaration in webgl_video_panorama_equirectangular

examples/webgl_video_panorama_equirectangular.html

@@ -43,7 +43,11 @@
 			lon = 0, onMouseDownLon = 0,
 			lat = 0, onMouseDownLat = 0,
 			phi = 0, theta = 0,
-			distance = 500;
+			distance = 500,
+			onPointerDownPointerX = 0,
+			onPointerDownPointerY = 0,
+			onPointerDownLon = 0,
+			onPointerDownLat = 0;
 
 			init();
 			animate();