Break html_tests.dart into multiple tests

client/tests/client/html/MeasurementTests.dart

-// 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.
-}