Let repaint tests test pixels by default

third_party/WebKit/LayoutTests/svg/custom/js-late-clipPath-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"/>
+<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="runRepaintTest()">
+<script xlink:href="../../fast/repaint/resources/repaint.js"/>
 <g id="content" transform="scale(1, 1.5)">
      <text font-size="60" fill="navy" clip-path="url(#dynClip)" x="10" y="70">Clipped. INVISIBLE.</text>
 </g>
 <script>
     window.testIsAsync = true;
     var content = document.getElementById("content");
 
     function repaintTest() {
         setTimeout(createClipPath, 0);
     }
 
     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);
 
         finishRepaintTest();
     }
 </script>
 
 </svg>