Rewrite svg/dynamic-updates to use text-based repaint harness

LayoutTests/fast/repaint/resources/text-based-repaint.js

Index: LayoutTests/fast/repaint/resources/text-based-repaint.js
diff --git a/LayoutTests/fast/repaint/resources/text-based-repaint.js b/LayoutTests/fast/repaint/resources/text-based-repaint.js
index d6403fc5acae3a22a5f6052ac69730fc9fbec188..2170cda5d353dada52ca8531dbb8319931c4d009 100644
--- a/LayoutTests/fast/repaint/resources/text-based-repaint.js
+++ b/LayoutTests/fast/repaint/resources/text-based-repaint.js
@@ -1,7 +1,10 @@
 function runRepaintTest()
 {
     if (window.testRunner && window.internals) {
-        window.testRunner.dumpAsText();
+        if (window.enablePixelTesting)
+            window.testRunner.dumpAsTextWithPixelResults();
+        else
+            window.testRunner.dumpAsText();
 
         if (document.body)
             document.body.offsetTop;
@@ -21,7 +24,10 @@ function runRepaintTest()
 
         var pre = document.createElement('pre');
         document.body.appendChild(pre);
-        pre.innerHTML = repaintRects;
+        pre.textContent += repaintRects;
+
+        if (window.afterTest)
+            window.afterTest();
     } else {
         setTimeout(repaintTest, 100);
     }