Implement measurement using futures

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
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+++ b/client/tests/client/html/MeasurementTests.dart
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+// Copyright (c) 2011, 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.
+
+void testMeasurement() { 
+  asyncTest('measurement is async but before setTimout 0', 1, () {
+    final element = document.body;
+    bool timeout0 = false;
+    bool fnComplete = false;
+    bool animationFrame = false;
+    window.setTimeout(() { timeout0 = true; }, 0);
+    final computedStyle = element.computedStyle;
+    computedStyle.then((style) {
+      Expect.equals(style.getPropertyValue('left'), 'auto');
+      Expect.isTrue(fnComplete);
+      Expect.isFalse(timeout0);
+      Expect.isFalse(animationFrame);
+      callbackDone();
+    });
+    Expect.isFalse(computedStyle.isComplete);
+    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.
+}