schedule redraw before actually redrawing.

js/pixl/public/trixl.html

		}
		trixl.step = function(t) {
			trixl.redraw(t);
			trixl.step.reqId = requestAnimationFrame(trixl.step);
			trixl.redraw(t);
		}
		trixl.start = function() {
			trixl.step.reqId = requestAnimationFrame(trixl.step);