Refactor of various layout tests to use RAF

LayoutTests/resources/js-test.js

 // svg/dynamic-updates tests set enablePixelTesting=true, as we want to dump text + pixel results
 if (self.testRunner) {
     if (self.enablePixelTesting)
         testRunner.dumpAsTextWithPixelResults();
     else
         testRunner.dumpAsText();
 }
 
 var isJsTest = true;
 
@@ skipping 673 matching lines @@
 }
 
 // With Oilpan tests that rely on garbage collection need to go through
 // the event loop in order to get precise garbage collections. Oilpan
 // uses conservative stack scanning when not at the event loop and that
 // can artificially keep objects alive. Therefore, tests that need to check
 // that something is dead need to use this asynchronous collectGarbage
 // function.
 function asyncGC(callback) {
     GCController.collectAll();
-    setTimeout(callback, 0);
+    requestAnimationFrame(callback);
 }
 
 function gc() {
     if (typeof GCController !== "undefined")
         GCController.collectAll();
     else {
         var gcRec = function (n) {
             if (n < 1)
                 return {};
             var temp = {i: "ab" + i + (i / 100000)};
             temp += "foo";
             gcRec(n-1);
         };
         for (var i = 0; i < 1000; i++)
             gcRec(10);
     }
 }
 
 function asyncMinorGC(callback) {
     if (typeof GCController !== "undefined")
         GCController.minorCollect();
     else
         testFailed("Minor GC is available only when you enable the --expose-gc option in V8.");
-    setTimeout(callback, 0);
+    requestAnimationFrame(callback);
 }
 
 function isSuccessfullyParsed()
 {
     // FIXME: Remove this and only report unexpected syntax errors.
     successfullyParsed = !unexpectedErrorMessage;
     shouldBeTrue("successfullyParsed");
     debug('<br /><span class="pass">TEST COMPLETE</span>');
 }
 
@@ skipping 84 matching lines @@
     testPassed = function(msg) {
         workerPort.postMessage('PASS:' + msg);
     };
     finishJSTest = function() {
         workerPort.postMessage('DONE:');
     };
     debug = function(msg) {
         workerPort.postMessage(msg);
     };
 }