Remove more testRunner.display() calls from LayoutTests

LayoutTests/fast/dom/Window/post-message-crash.html

Index: LayoutTests/fast/dom/Window/post-message-crash.html
diff --git a/LayoutTests/fast/dom/Window/post-message-crash.html b/LayoutTests/fast/dom/Window/post-message-crash.html
index d317281f42675d3995971b0dc343cc6e72af7597..9157d9764a6df2c91a74b113edd24b832cdd9394 100644
--- a/LayoutTests/fast/dom/Window/post-message-crash.html
+++ b/LayoutTests/fast/dom/Window/post-message-crash.html
@@ -6,6 +6,7 @@
 
 <pre>FAIL</pre>
 
+<script src="../../../resources/run-after-display.js"></script>
 <script>
 if (window.testRunner) {
     testRunner.dumpAsText();
@@ -23,17 +24,17 @@ window.onerror = function() {
     return true;
 };
 
-requestAnimationFrame(postMessage);
+requestAnimationFrame(function() {
+    postMessage();
+    runAfterDisplay(function() {
+        setTimeout(function() {
+            if (window.testRunner)
+                testRunner.notifyDone();
+        }, 50);
+    });
+});
 setTimeout(postMessage);
 
-if (window.testRunner)
-    testRunner.display();
-
-setTimeout(function() {
-    if (window.testRunner)
-        testRunner.notifyDone();
-}, 50);
-
 </script>
 </body>
 </html>