Remove testRunner.display() from most compositing/ tests

LayoutTests/compositing/repaint/newly-composited-repaint-rect.html

Index: LayoutTests/compositing/repaint/newly-composited-repaint-rect.html
diff --git a/LayoutTests/compositing/repaint/newly-composited-repaint-rect.html b/LayoutTests/compositing/repaint/newly-composited-repaint-rect.html
index 018449be5a62c02256bc719af5e3fcc881559d14..77182642e1452a88aaf3c393231439d6c8a49324 100644
--- a/LayoutTests/compositing/repaint/newly-composited-repaint-rect.html
+++ b/LayoutTests/compositing/repaint/newly-composited-repaint-rect.html
@@ -46,6 +46,7 @@
 
 </head>
 
+<script src="../../resources/run-after-display.js"></script>
 <script src="../../fast/repaint/resources/repaint.js"></script>
 
 <script>
@@ -64,14 +65,11 @@
 
         // Force DumpRenderTree to do a layout and repaint here, this is where the repaintRect
         // goes wrong because it does not get updated for a newly composited element.
-        if (window.testRunner)
-            testRunner.display();
-
-        window.setTimeout(function() {
+        runAfterDisplay(function() {
             // Scrolling a little will demonstrate whether the repaint rect is correct or not.
             document.getElementById('scrolldiv').scrollTop = 500;
             testRunner.notifyDone();
-        }, 0);
+        });
     }
 
 </script>