Make KeyboardEvent cross-browser consistent.

tests/html/keyboard_event_test.dart

+library KeyboardEventTest;
+import '../../pkg/unittest/lib/unittest.dart';
+import '../../pkg/unittest/lib/html_config.dart';
+import 'dart:html';
+
+// Test that we are correctly determining keyCode and charCode uniformly across
+// browsers.
+
+main() {
+
+  useHtmlConfiguration();
+
+  keydownHandlerTest(KeyEvent e) {
+    print('keycode ${e.keyCode}');

[blois, 2012/11/29 17:06:34]

Can you add a comment as to why this doesn't do much?

[Emily Fortuna, 2012/11/29 19:19:50]

Sure... I can just delete the test, because it really isn't even testing
anything automatically. Do you think I should keep it? It's essentially a no-op
without user interaction.

[blois, 2012/11/29 21:04:55]

It may be handy to keep around for debugging since we don't have good tests. Is
there an alternate place for it?

+    print('charcode ${e.charCode}');
+    //expect(e.charCode, 0);
+    //expect(e.keyCode, 0);
+  }
+
+  test('keys', () {
+    var controller = new KeyboardEventController.keydown(document.window);
+    controller.add(keydownHandlerTest);
+    document.window.on.keyDown.add((e) => print('regular listener'), false);
+  });
+}
+
+