Attempt to deflake svg/custom/js-late-{clipPath,gradient}-and-...svg

LayoutTests/svg/custom/js-late-clipPath-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"/>
 <g id="content" transform="scale(1, 1.5)"/>
 <script>
+    window.testIsAsync = true;
+    function repaintTest() {
+        runAfterDisplay(createObject);
+    }
+
     var content = document.getElementById("content");
-    function repaintTest() {
-        if (window.testRunner)
-            testRunner.waitUntilDone();
-        setTimeout(createObject, 0);
-    }
 
     function createObject()
     {
         var text = document.createElementNS("http://www.w3.org/2000/svg", "text");
         text.setAttribute("font-size", "60");
         text.setAttribute("fill", "navy");
         text.setAttribute("clip-path", "url(#dynClip)");
         text.setAttribute("x", "10");
         text.setAttribute("y", "70");
 
         text.appendChild(document.createTextNode("Clipped. INVISIBLE."));        
         content.appendChild(text);
 
-        setTimeout(createClipPath, 0);
+        runAfterDisplay(createClipPath);
     }
 
     function createClipPath()
     {
         var clipPath = document.createElementNS("http://www.w3.org/2000/svg", "clipPath");
         clipPath.setAttribute("id", "dynClip");
         clipPath.setAttribute("clipPathUnits", "userSpaceOnUse");
 
         var path = document.createElementNS("http://www.w3.org/2000/svg", "path");
         path.setAttribute("d", "M 0 0 l 200 0 l 0 200 l -200 0 Z");
 
         clipPath.appendChild(path);
         content.appendChild(clipPath);
 
-        if (window.testRunner)
-            testRunner.notifyDone();
+        finishRepaintTest();
     }
 </script>
 
 </svg>