- Allow for loading dart:html and friends into the standalone

runtime/lib/errors_patch.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.
 
 import 'dart:_internal' as internal;
 import 'dart:convert' show JSON;
 
 patch class Error {
   /* patch */ static String _objectToString(Object object) {
     return Object._toString(object);
@@ skipping 89 matching lines @@
   String _url;
   int _line;
 }
 
 class _InternalError {
   const _InternalError(this._msg);
   String toString() => "InternalError: '${_msg}'";
   final String _msg;
 }
 
+patch class UnsupportedError {
+  static _throwNew(String msg) {
+    throw new UnsupportedError(msg);
+  }
+}
+
 patch class CyclicInitializationError {
   static _throwNew(String variableName) {
     throw new CyclicInitializationError(variableName);
   }
 }
 
 patch class AbstractClassInstantiationError {
   AbstractClassInstantiationError._create(
       this._className, this._url, this._line);
 
@@ skipping 210 matching lines @@
       msg_buf.write(
           "NoSuchMethodError: incorrect number of arguments passed to "
           "method named '$memberName'\n"
           "Receiver: $receiver_str\n"
           "Tried calling: $memberName($actualParameters)\n"
           "Found: $memberName($formalParameters)");
     }
     return msg_buf.toString();
   }
 }