Example showing alternate async measurement solution

client/tests/client/html/MeasurementTests.dart

Index: client/tests/client/html/MeasurementTests.dart
diff --git a/client/tests/client/html/MeasurementTests.dart b/client/tests/client/html/MeasurementTests.dart
index 5b0864af1deaf8fd574af3f7cca073d8f84b5ad2..453d9fea4e31ac215470698e2d6df09db8119e32 100644
--- a/client/tests/client/html/MeasurementTests.dart
+++ b/client/tests/client/html/MeasurementTests.dart
@@ -1,4 +1,4 @@
-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
@@ -8,35 +8,25 @@ void testMeasurement() {
     bool timeout0 = false;
     bool fnComplete = false;
     bool animationFrame = false;
+    bool callbackComplete = false;
     window.setTimeout(() { timeout0 = true; }, 0);
-    final computedStyle = element.computedStyle;
-    computedStyle.then((style) {
+    window.requestMeasurementFrame(() {
+      callbackComplete = true;
+      final style = element.computedStyle;
       Expect.equals(style.getPropertyValue('left'), 'auto');
       Expect.isTrue(fnComplete);
       Expect.isFalse(timeout0);
       Expect.isFalse(animationFrame);
-      callbackDone();
+      return callbackDone;
     });
-    Expect.isFalse(computedStyle.isComplete);
+    Expect.isFalse(callbackComplete);
     fnComplete = true;
   });
 
-  asyncTest('requestLayoutFrame', 1, () {
-    var rect;
-    var computedStyle;
-    window.requestLayoutFrame(() {
-      Expect.isTrue(rect.isComplete);
-      Expect.isTrue(computedStyle.isComplete);
-      callbackDone();
-    });
-
-    final element = document.body;
-    rect = element.rect;
-    computedStyle = element.computedStyle;
-    Expect.isFalse(rect.isComplete);
-    Expect.isFalse(computedStyle.isComplete);
-  });
-
   // TODO(jacobr): add more tests that the results return by measurement
   // functions are correct.
+
+  // TODO(jacobr): add tests that the dom cannot be manipulated while layout
+  // is in progress and measurement cannot be performed unless
+  // requestMeasurementFrame is called.
 }