Refactor of various layout tests to use RAF

LayoutTests/resources/run-after-display.js

 function runAfterDisplay(callback) {
     window.requestAnimationFrame(function() {
         // At this point, only the animate has happened, but no compositing
         // or layout.  Use a timeout for the callback so that notifyDone
         // can be called inside of it.
-        window.setTimeout(callback, 0);
+        window.setTimeout(callback, 1);
     });
 }