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

sdk/lib/html/html_common/standalone_additions.dart

Index: sdk/lib/html/html_common/standalone_additions.dart
diff --git a/sdk/lib/html/html_common/standalone_additions.dart b/sdk/lib/html/html_common/standalone_additions.dart
new file mode 100644
index 0000000000000000000000000000000000000000..3afc1ba1ad8f734dbbdad0985bd4c26ae6d765d2
--- /dev/null
+++ b/sdk/lib/html/html_common/standalone_additions.dart
@@ -0,0 +1,11 @@
+part of html_common;
+
+class Creates {
+  final String types;
+  const Creates(this.types);
+}
+
+class Returns {
+  final String types;
+  const Returns(this.types);
+}