Fixing up setting styles to invalidate on IE9.

tests/html/cssstyledeclaration_test.dart

Index: tests/html/cssstyledeclaration_test.dart
diff --git a/tests/html/cssstyledeclaration_test.dart b/tests/html/cssstyledeclaration_test.dart
index 087a2f68fc38529d4ce82125c24eb54f15b780b1..91cfb60b5efb7fa10167b7d701334b404ffcfd47 100644
--- a/tests/html/cssstyledeclaration_test.dart
+++ b/tests/html/cssstyledeclaration_test.dart
@@ -63,8 +63,6 @@ main() {
     element.style.transform = 'translateX(10px)';
     document.body.elements.add(element);
 
-    var style = new CSSStyleDeclaration();
-
     element.getComputedStyle('').then(expectAsync1(
       (CSSStyleDeclaration style) {
         // Some browsers will normalize this, so it'll be a matrix rather than
@@ -73,4 +71,20 @@ main() {
       }
     ));
   });
+
+  // IE9 requires an extra poke for some properties to get applied.
+  test('IE9 Invalidation', () {
+    var element = new DivElement();
+    document.body.elements.add(element);
+
+    // Need to wait one tick after the element has been added to the page.
+    window.setTimeout(expectAsync0(() {
+      element.style.textDecoration = 'underline';
+      element.getComputedStyle('').then(expectAsync1(
+        (CSSStyleDeclaration style) {
+          expect(style.textDecoration, equals('underline'));
+        }
+      ));
+    }), 10);
+  });
 }