Refactor of various layout tests to use RAF

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

Index: LayoutTests/svg/custom/js-late-pattern-and-object-creation.svg
diff --git a/LayoutTests/svg/custom/js-late-pattern-and-object-creation.svg b/LayoutTests/svg/custom/js-late-pattern-and-object-creation.svg
index bfe76a1c9e3dc3c939e7a94ab6907eafddd0b374..04380e6e3d05b276bd7e077360bf54d77f25923a 100644
--- a/LayoutTests/svg/custom/js-late-pattern-and-object-creation.svg
+++ b/LayoutTests/svg/custom/js-late-pattern-and-object-creation.svg
@@ -9,7 +9,7 @@
     var content = document.getElementById("content");
 
     function repaintTest() {
-        setTimeout(createPatterns, 0);
+        requestAnimationFrame(createPatterns);
     }
 
     function createPatterns()
@@ -70,7 +70,7 @@
 
         content.appendChild(pattern2);
 
-        setTimeout(setupPatternUsers, 0);
+        requestAnimationFrame(setupPatternUsers);
     }
 
     function setupPatternUsers()