Output repaint rects for svg repaint tests

LayoutTests/svg/custom/use-elementInstance-methods.svg

 <svg version="1.1" baseProfile="basic" 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"/>
   <defs>
      <g id="reference">
          <rect x="240" y="1" width="239" height="358" />
          <circle cx="240" cy="1" width="39" height="58" />
      </g>
 
     <script type="text/ecmascript">
     <![CDATA[
+      window.outputRepaintRects = false;
       function repaintTest() {
           if (window.eventSender) {
               testRunner.waitUntilDone();
               eventSender.mouseMoveTo(250, 50);
               eventSender.mouseDown();
               eventSender.mouseUp();
           }
       }
 
       function test (event) {
@@ skipping 40 matching lines @@
             testRunner.notifyDone();
       }
     ]]>
     </script>
   </defs>
 
   <text x="100" y="50" id="status">Test failed.</text>
   <use id="use" xlink:href="#reference" onclick="test(evt)" fill="grey" />
   <rect id="test-frame" x="1" y="1" width="478" height="358" fill="none" stroke="#000"/>
 </svg>