sdk/lib/html/dart2js/html_dart2js.dart

Index: sdk/lib/html/dart2js/html_dart2js.dart
diff --git a/sdk/lib/html/dart2js/html_dart2js.dart b/sdk/lib/html/dart2js/html_dart2js.dart
index 0e5bdcdad849feaa0bbcc6398757a03bdeae20db..5348c39ae06b86eff1c9e8fcad15ae0b172820ac 100644
--- a/sdk/lib/html/dart2js/html_dart2js.dart
+++ b/sdk/lib/html/dart2js/html_dart2js.dart
@@ -14337,6 +14337,32 @@ class HtmlDocument extends Document native "HTMLDocument" {
    * This custom element can also be instantiated via HTML using the syntax
    * `<input is="x-bar"></input>`
    *
+   * The [nativeTagName] parameter is needed by platforms without native support
+   * when subclassing a native type other than:
+   *
+   * * HtmlElement
+   * * SvgElement
+   * * AnchorElement
+   * * AudioElement
+   * * ButtonElement
+   * * CanvasElement
+   * * DivElement
+   * * ImageElement
+   * * InputElement
+   * * LIElement
+   * * LabelElement
+   * * MenuElement
+   * * MeterElement
+   * * OListElement
+   * * OptionElement
+   * * OutputElement
+   * * ParagraphElement
+   * * PreElement
+   * * ProgressElement
+   * * SelectElement
+   * * SpanElement
+   * * UListElement
+   * * VideoElement
    */
   void register(String tag, Type customElementClass, {String extendsTag}) {
     _registerCustomElement(JS('', 'window'), this, tag, customElementClass,
@@ -14378,28 +14404,6 @@ class HtmlDocument extends Document native "HTMLDocument" {
   @Experimental()
   Stream<Event> get onVisibilityChange =>
       visibilityChangeEvent.forTarget(this);
-
-  /// Creates an element upgrader which can be used to change the Dart wrapper
-  /// type for elements.
-  ///
-  /// The type specified must be a subclass of HtmlElement, when an element is
-  /// upgraded then the created constructor will be invoked on that element.
-  ///
-  /// If the type is not a direct subclass of HtmlElement then the extendsTag
-  /// parameter must be provided.
-  @Experimental()
-  ElementUpgrader createElementUpgrader(Type type, {String extendsTag}) {
-    return new _JSElementUpgrader(this, type, extendsTag);
-  }
-}
-
-/// A utility for changing the Dart wrapper type for elements.
-abstract class ElementUpgrader {
-  /// Upgrade the specified element to be of the Dart type this was created for.
-  ///
-  /// After upgrading the element passed in is invalid and the returned value
-  /// should be used instead.
-  Element upgrade(Element element);
 }
 // 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
@@ -35260,7 +35264,7 @@ void _registerCustomElement(context, document, String tag, Type type,
   if (extendsTagName == null) {
     if (baseClassName != 'HTMLElement') {
       throw new UnsupportedError('Class must provide extendsTag if base '
-          'native class is not HtmlElement');
+          'native class is not HTMLElement');
     }
   } else {
     if (!JS('bool', '(#.createElement(#) instanceof window[#])',
@@ -35301,63 +35305,6 @@ void _registerCustomElement(context, document, String tag, Type type,
 void _initializeCustomElement(Element e) {
   // TODO(blois): Add validation that this is only in response to an upgrade.
 }
-
-/// Dart2JS implementation of ElementUpgrader
-class _JSElementUpgrader implements ElementUpgrader {
-  var _interceptor;
-  var _constructor;
-  var _nativeType;
-
-  _JSElementUpgrader(Document document, Type type, String extendsTag) {
-    var interceptorClass = findInterceptorConstructorForType(type);
-    if (interceptorClass == null) {
-      throw new ArgumentError(type);
-    }
-
-    _constructor = findConstructorForNativeSubclassType(type, 'created');
-    if (_constructor == null) {
-      throw new ArgumentError("$type has no constructor called 'created'");
-    }
-
-    // Workaround for 13190- use an article element to ensure that HTMLElement's
-    // interceptor is resolved correctly.
-    getNativeInterceptor(new Element.tag('article'));
-
-    var baseClassName = findDispatchTagForInterceptorClass(interceptorClass);
-    if (baseClassName == null) {
-      throw new ArgumentError(type);
-    }
-
-    if (extendsTag == null) {
-      if (baseClassName != 'HTMLElement') {
-        throw new UnsupportedError('Class must provide extendsTag if base '
-            'native class is not HtmlElement');
-      }
-      _nativeType = HtmlElement;
-    } else {
-      var element = document.createElement(extendsTag);
-      if (!JS('bool', '(# instanceof window[#])',
-          element, baseClassName)) {
-        throw new UnsupportedError(
-            'extendsTag does not match base native class');
-      }
-      _nativeType = element.runtimeType;
-    }
-
-    _interceptor = JS('=Object', '#.prototype', interceptorClass);
-  }
-
-  Element upgrade(Element element) {
-    // Only exact type matches are supported- cannot be a subclass.
-    if (element.runtimeType != _nativeType) {
-      throw new ArgumentError('element is not subclass of $_nativeType');
-    }
-
-    setNativeSubclassDispatchRecord(element, _interceptor);
-    JS('', '#(#)', _constructor, element);
-    return element;
-  }
-}
 // 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.