List.unmodifiable

tool/input_sdk/patch/internal_patch.dart

Index: tool/input_sdk/patch/internal_patch.dart
diff --git a/tool/input_sdk/patch/internal_patch.dart b/tool/input_sdk/patch/internal_patch.dart
index 16afd5f3aa6332ec62190bdf31b5ff3455f4f898..dbc7ef13c3f66417fb920e7959975fa469e9d4b5 100644
--- a/tool/input_sdk/patch/internal_patch.dart
+++ b/tool/input_sdk/patch/internal_patch.dart
@@ -19,7 +19,13 @@ void printToConsole(String line) {
 }
 
 @patch
-List makeListFixedLength(List growableList) {
+List/*<E>*/ makeListFixedLength/*<E>*/(List/*<E>*/ growableList) {
   JSArray.markFixedList(growableList);
   return growableList;
 }
+
+@patch
+List/*<E>*/ makeFixedListUnmodifiable/*<E>*/(List/*<E>*/ list) {
+  JSArray.markUnmodifiableList(list);
+  return list;
+}