Add all dart:html tests from the sdk to test/codegen.

test/codegen/lib/html/transferables_test.dart

+// Copyright (c) 2012, 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.
+
+library TransferableTest;
+import 'package:unittest/unittest.dart';
+import 'package:unittest/html_config.dart';
+import 'dart:html';
+import 'dart:typed_data';
+
+main() {
+  useHtmlConfiguration();
+
+  var isByteBuffer =
+      predicate((x) => x is ByteBuffer, 'is an ByteBuffer');
+
+  test('TransferableTest', () {
+    if (!Platform.supportsTypedData) {
+      return;
+    }
+
+    final buffer = (new Float32List(3)).buffer;
+    window.postMessage({
+        'id': 'transferable data',
+        'buffer': buffer
+      }, '*', [buffer]);
+
+    return window.onMessage.firstWhere(
+      (e) {
+        return e.data is Map && e.data['id'] == 'transferable data';
+      }).then((messageEvent) {
+        expect(messageEvent.data['buffer'], isByteBuffer);
+      });
+  });
+}