- 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..98814f8dff413ca96567b8366a1d8f46d06133ee 100644
--- a/runtime/lib/errors_patch.dart
+++ b/runtime/lib/errors_patch.dart
@@ -107,6 +107,12 @@ class _InternalError {
   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);