Adds @HtmlImport with both dynamic and transformer based implementations. Still need an HtmlInliner…

test/custom_element_proxy_test.dart

 // 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.
 library custom_element_proxy_test;
 
 import 'dart:async';
 import 'dart:html';
 import 'dart:js';
 import 'package:initialize/initialize.dart' as init;
 import 'package:unittest/html_config.dart';
@@ skipping 17 matching lines @@
   factory ExtendedElement() =>
       document.createElement('input', 'extended-element');
 
   bool get isExtendedElement =>
       new JsObject.fromBrowserObject(this)['isExtendedElement'];
 }
 
 main() {
   useHtmlConfiguration();
   init.run().then((_) {
+    var container = querySelector('#container') as DivElement;
 
-  var container = querySelector('#container') as DivElement;
+    tearDown(() {
+      container.children.clear();
+    });
 
-  tearDown(() {
-    container.children.clear();
-  });
+    test('basic custom element', () {
+      container.append(new BasicElement());
+      container.appendHtml('<basic-element></basic_element>');
+      // TODO(jakemac): after appendHtml elements are upgraded asynchronously,
+      // why? https://github.com/dart-lang/web-components/issues/4
+      return new Future(() {}).then((_) {
+        var elements = container.querySelectorAll('basic-element');
+        expect(elements.length, 2);
+        for (BasicElement element in elements) {
+          print(element.outerHtml);
+          print(element.runtimeType);
+          expect(element.isBasicElement, isTrue);
+        }
+      });
+    });
 
-  test('basic custom element', () {
-    container.append(new BasicElement());
-    container.appendHtml('<basic-element></basic_element>');
-    // TODO(jakemac): after appendHtml elements are upgraded asynchronously,
-    // why? https://github.com/dart-lang/web-components/issues/4
-    return new Future(() {}).then((_) {
-      var elements = container.querySelectorAll('basic-element');
-      expect(elements.length, 2);
-      for (BasicElement element in elements) {
-        print(element.outerHtml);
-        print(element.runtimeType);
-        expect(element.isBasicElement, isTrue);
-      }
+    test('extends custom element', () {
+      container.append(new ExtendedElement());
+      container.appendHtml('<input is="extended-element" />');
+      // TODO(jakemac): after appendHtml elements are upgraded asynchronously,
+      // why? https://github.com/dart-lang/web-components/issues/4
+      return new Future(() {}).then((_) {
+        var elements = container.querySelectorAll('input');
+        expect(elements.length, 2);
+        for (ExtendedElement element in elements) {
+          expect(element.isExtendedElement, isTrue);
+        }
+      });
     });
   });
-
-  test('extends custom element', () {
-    container.append(new ExtendedElement());
-    container.appendHtml('<input is="extended-element" />');
-    // TODO(jakemac): after appendHtml elements are upgraded asynchronously,
-    // why? https://github.com/dart-lang/web-components/issues/4
-    return new Future(() {}).then((_) {
-      var elements = container.querySelectorAll('input');
-      expect(elements.length, 2);
-      for (ExtendedElement element in elements) {
-        expect(element.isExtendedElement, isTrue);
-      }
-    });
-  });
-
-  });
 }