Refactor of various layout tests to use RAF

LayoutTests/svg/repaint/image-with-clip-path.svg

Index: LayoutTests/svg/repaint/image-with-clip-path.svg
diff --git a/LayoutTests/svg/repaint/image-with-clip-path.svg b/LayoutTests/svg/repaint/image-with-clip-path.svg
index b801db7e7a35600d8865f857710fb62a2df9de55..1f07f443db9197ed4abe51c84c161b2ac80e77c3 100644
--- a/LayoutTests/svg/repaint/image-with-clip-path.svg
+++ b/LayoutTests/svg/repaint/image-with-clip-path.svg
@@ -1,5 +1,6 @@
 <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" type="text/javascript"></script>
+    <script xlink:href="../../resources/run-after-display.js"></script>
     <text y="-10">Bug 76559: All red should disappear</text>
     <g id="g" transform="translate(0, 0)">
         <defs>
@@ -31,12 +32,12 @@
     }
 
     function nextStep() {
-        i.onload = function() { setTimeout(finishTest, 0); };
+        i.onload = function() { requestAnimationFrame(finishTest); };
         update(200, 50, green);
     }
 
     function repaintTest() {
-        i.onload = function() { setTimeout(nextStep, 0); };
+        i.onload = function() { runAfterDisplay(nextStep); };
         update(50, 100, red);
     }
 </script>