Refactor of various layout tests to use RAF

LayoutTests/svg/custom/js-late-marker-and-object-creation.svg

Index: LayoutTests/svg/custom/js-late-marker-and-object-creation.svg
diff --git a/LayoutTests/svg/custom/js-late-marker-and-object-creation.svg b/LayoutTests/svg/custom/js-late-marker-and-object-creation.svg
index 18b4f6409f1ee33343026c81b53c5c6d56d83d65..4600853278c9e45fa512cb10c841872061c8babf 100644
--- a/LayoutTests/svg/custom/js-late-marker-and-object-creation.svg
+++ b/LayoutTests/svg/custom/js-late-marker-and-object-creation.svg
@@ -19,7 +19,7 @@
     var content = document.getElementById("content");
 
     function repaintTest() {
-        setTimeout(createObject, 0);
+        requestAnimationFrame(createObject);
     }
 
     function createObject()
@@ -34,7 +34,7 @@
         path.setAttribute("d", "M 130 135 L 180 135 L 180 185");
 
         content.appendChild(path);
-        setTimeout(createMarker, 0);
+        requestAnimationFrame(createMarker);
     }
 
     function createMarker()