Making all callbacks use zones (take 2)

tools/dom/src/shared_html.dart

Index: tools/dom/src/shared_html.dart
diff --git a/tools/dom/src/shared_html.dart b/tools/dom/src/shared_html.dart
new file mode 100644
index 0000000000000000000000000000000000000000..165e9196c2be9f25b80b2badb07282956d66c550
--- /dev/null
+++ b/tools/dom/src/shared_html.dart
@@ -0,0 +1,14 @@
+// Copyright (c) 2013, 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.
+
+part of dart.dom.html;
+
+_wrapZone(callback) {
+  // For performance reasons avoid wrapping if we are in the root zone.
+  if (Zone.current == Zone.ROOT) return callback;
+  return Zone.current.bindUnaryCallback(callback, runGuarded: true);
+}
+
+Element query(String selector) => document.query(selector);
+ElementList queryAll(String selector) => document.queryAll(selector);