Support for type extensions in Dartium (part 1)

tools/dom/src/native_DOMImplementation.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.
 
 part of html;
 
 class _Utils {
   static double dateTimeToDouble(DateTime dateTime) =>
       dateTime.millisecondsSinceEpoch.toDouble();
   static DateTime doubleToDateTime(double dateTime) {
@@ skipping 177 matching lines @@
     (str != null && str[str.length - 1] == '.') ? str.substring(0, str.length - 1) : str;
 
   static String addTrailingDot(String str) => '${str}.';
 
   static bool isNoSuchMethodError(obj) => obj is NoSuchMethodError;
 
   // TODO(jacobr): we need a failsafe way to determine that a Node is really a
   // DOM node rather than just a class that extends Node.
   static bool isNode(obj) => obj is Node;
 
+  static bool _isBuiltinType(ClassMirror cls) {
+    // TODO(vsm): Find a less hackish way to do this.
+    LibraryMirror lib = cls.owner;
+    String libName = lib.uri.toString();
+    return libName.startsWith('dart:');
+  }
+
   static void register(String tag, Type type) {
     // TODO(vsm): Move these checks into native code.
     if (type == null) {
       throw new UnsupportedError("Invalid null type.");
     }
     ClassMirror cls = reflectClass(type);
-    LibraryMirror lib = cls.owner;
-    String libName = lib.uri.toString();
-    if (libName.startsWith('dart:')) {
+    if (_isBuiltinType(cls)) {
       throw new UnsupportedError("Invalid custom element from $libName.");
     }
     ClassMirror superClass = cls.superclass;
 
     Symbol objectName = reflectClass(Object).qualifiedName;
     bool isRoot(ClassMirror cls) =>
       cls == null || cls.qualifiedName == objectName;
     // TODO(vsm): Support extending SvgElement as well.
     Symbol elementName = reflectClass(HtmlElement).qualifiedName;
     bool isElement(ClassMirror cls) =>
       cls != null && cls.qualifiedName == elementName;
 
+    ClassMirror nativeClass = _isBuiltinType(superClass) ? superClass : null;
     while(!isRoot(superClass) && !isElement(superClass)) {
       superClass = superClass.superclass;
+      if (nativeClass == null && _isBuiltinType(superClass)) {
+        nativeClass = superClass;
+      }
     }
 
     if (isRoot(superClass)) {
       throw new UnsupportedError("Invalid custom element doesn't inherit from HtmlElement.");
     }
-    _register(tag, type);
+    _register(tag, type, nativeClass.reflectedType);
   }
 
-  static void _register(String tag, Type type) native "Utils_register";
+  static void _register(String tag, Type customType, Type nativeType) native "Utils_register";
 }
 
 class _NPObject extends NativeFieldWrapperClass1 {
   _NPObject.internal();
   static _NPObject retrieve(String key) native "NPObject_retrieve";
   property(String propertyName) native "NPObject_property";
   invoke(String methodName, [List args = null]) native "NPObject_invoke";
 }
 
 class _DOMWindowCrossFrame extends NativeFieldWrapperClass1 implements
@@ skipping 181 matching lines @@
   _send(msg) {
     _sendToHelperIsolate(msg, _sendPort);
   }
 
   bool get isActive => _isActive;
 }
 
 get _pureIsolateTimerFactoryClosure =>
     ((int milliSeconds, void callback(Timer time), bool repeating) =>
         new _PureIsolateTimer(milliSeconds, callback, repeating));