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

runtime/lib/errors_patch.dart

Index: runtime/lib/errors_patch.dart
diff --git a/runtime/lib/errors_patch.dart b/runtime/lib/errors_patch.dart
index 29c14f5c595012a5806b91e9bfc7d46cd711ca88..aa429cc721ce2332bd2fb7c6ecd95c271845c744 100644
--- a/runtime/lib/errors_patch.dart
+++ b/runtime/lib/errors_patch.dart
@@ -105,6 +105,15 @@ class _InternalError {
   const _InternalError(this._msg);
   String toString() => "InternalError: '${_msg}'";
   final String _msg;
+  static _throwNew(String msg) {
+    throw new _InternalError(msg);
+  }
+}
+
+patch class UnsupportedError {
+  static _throwNew(String msg) {
+    throw new UnsupportedError(msg);
+  }
 }
 
 patch class CyclicInitializationError {