Convert svg repaint tests to pixel test only repaint

LayoutTests/svg/text/ems-display-none.svg

 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" onload="runRepaintTest()">
-    <script xlink:href="../../fast/repaint/resources/repaint.js"/>
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" onload="runRepaintAndPixelTest()">
+    <script xlink:href="../../fast/repaint/resources/text-based-repaint.js"/>
     <g font-size="40">
         <text id="text" y="50" display="none">
             <tspan id="tspan" x="50" dy="1em">Two lines of text should be visible.</tspan>
         </text>
     </g>
     <script>
         function repaintTest() {
             var tspan1 = document.getElementById("tspan");
             var result = 0;
             try {
                 result = tspan1.dy.baseVal.getItem(0).value;
             } catch(e) { }
 
             var tspan2 = document.createElementNS("http://www.w3.org/2000/svg", "tspan");
             tspan2.setAttribute("x", "50");
             tspan2.setAttribute("dy", result);
             tspan2.textContent = "Two lines of text should be visible.";
             document.getElementById("text").appendChild(tspan2);
             document.getElementById("text").setAttribute("display", "inline");
         }
     </script>
 </svg>