Example showing alternate async measurement solution

client/tests/client/samples/total/total_test_lib.dart

Index: client/tests/client/samples/total/total_test_lib.dart
diff --git a/client/tests/client/samples/total/total_test_lib.dart b/client/tests/client/samples/total/total_test_lib.dart
index 826f36a0575a378dc063a43a2049f778a54119cb..835410f8955e044c996304db657972a7b458bda5 100644
--- a/client/tests/client/samples/total/total_test_lib.dart
+++ b/client/tests/client/samples/total/total_test_lib.dart
@@ -57,8 +57,8 @@ totalTests() {
     body.nodes.add(div);
 
     HtmlUtils.setIntegerProperty(div, "left", 100, "px");
-    div.computedStyle.then((CSSStyleDeclaration computedStyle) { 
-      String valueAsString = computedStyle.getPropertyValue("left");
+    window.requestMeasurementFrame(() {
+      String valueAsString = div.computedStyle.left;
       // FIXME: Test fails, with valueAsString == "auto". However,
       // setIntegerProperty works when tested in practice, so there is
       // something wrong with recovering the value.