Remove testRunner.display() from most compositing/ tests

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);
+    });
+}