Refactor of various layout tests to use RAF

LayoutTests/svg/custom/js-late-marker-and-object-creation.svg

 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1 Basic//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11-basic.dtd">  
 <svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"  id="svg-root" width="100%" height="100%" viewBox="0 0 480 360" onload="runRepaintAndPixelTest()">
 <script xlink:href="../../fast/repaint/resources/text-based-repaint.js"/>
 <defs id="defs">
     <marker id="markerStart" viewBox="0 0 10 10" markerWidth="2" markerHeight="2" refX="5" refY="5" markerUnits="strokeWidth">
         <rect width="10" height="10" fill="red" stroke="none"/>
     </marker>
     <marker id="markerEnd" viewBox="0 0 10 10" markerWidth="2" markerHeight="2" refX="5" refY="5" markerUnits="strokeWidth">
         <path d="M 5 0 L 10 10 L 0 10 Z" fill="blue" stroke="none"/>
     </marker>
 </defs>
 
 <g id="content"/>
 
 <script>
     window.testIsAsync = true;
     var defs = document.getElementById("defs");
     var content = document.getElementById("content");
 
     function repaintTest() {
-        setTimeout(createObject, 0);
+        requestAnimationFrame(createObject);
     }
 
     function createObject()
     {
         var path = document.createElementNS("http://www.w3.org/2000/svg", "path");
         path.setAttribute("fill", "none");
         path.setAttribute("stroke", "black");
         path.setAttribute("stroke-width", "8");
         path.setAttribute("marker-start", "url(#markerStart)");
         path.setAttribute("marker-mid", "url(#markerMiddle)");
         path.setAttribute("marker-end", "url(#markerEnd)");
         path.setAttribute("d", "M 130 135 L 180 135 L 180 185");
 
         content.appendChild(path);
-        setTimeout(createMarker, 0);
+        requestAnimationFrame(createMarker);
     }
 
     function createMarker()
     {
         var marker = document.createElementNS("http://www.w3.org/2000/svg", "marker");
         marker.setAttribute("id", "markerMiddle");
         marker.setAttribute("viewBox", "0 0 10 10");
         marker.setAttribute("markerWidth", "2");
         marker.setAttribute("markerHeight", "2");
         marker.setAttribute("refX", "5");
         marker.setAttribute("refY", "5");
         marker.setAttribute("markerUnits", "strokeWidth");
 
         var circle = document.createElementNS("http://www.w3.org/2000/svg", "circle");
         circle.setAttribute("cx", "5");
         circle.setAttribute("cy", "5");
         circle.setAttribute("r", "5");
         circle.setAttribute("fill", "green");
         circle.setAttribute("stroke", "none");
 
         marker.appendChild(circle);
         defs.appendChild(marker);
 
         finishRepaintTest();
     }
 </script>
 
 </svg>