CustomElementProxy annotation

lib/custom_element_proxy.dart

Index: lib/custom_element_proxy.dart
diff --git a/lib/custom_element_proxy.dart b/lib/custom_element_proxy.dart
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+// Copyright (c) 2015, 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.
+import 'package:initialize/initialize.dart';
+import 'interop.dart';
+
+/// Annotation for a dart class which proxies a javascript custom element.
+/// This will not work unless `interop_support.js` is loaded.
+// TODO(jakemac): Add an @HtmlImport here to a new file which includes
+// `interop_support.js`. We will need to point everything else at that html file
+// as well for deduplication purposes (could even just copy it in as an inline
+// script so the js file no longer exists?).
+class CustomElementProxy implements Initializer<Type> {
+  final String tagName;
+  final String extendsTag;
+
+  const CustomElementProxy(this.tagName, {this.extendsTag});
+
+  void initialize(Type t) {
+    registerDartType(tagName, t, extendsTag: extendsTag);
+  }
+}