Add List.insert.

editor/util/plugins/com.google.dart.java2dart/resources/java_core.dart

Index: editor/util/plugins/com.google.dart.java2dart/resources/java_core.dart
diff --git a/editor/util/plugins/com.google.dart.java2dart/resources/java_core.dart b/editor/util/plugins/com.google.dart.java2dart/resources/java_core.dart
index 4da34a13a41eaf57b461814c397b0269c3884be8..18b763d55be83257b8172c0906d3c55db775397e 100644
--- a/editor/util/plugins/com.google.dart.java2dart/resources/java_core.dart
+++ b/editor/util/plugins/com.google.dart.java2dart/resources/java_core.dart
@@ -290,6 +290,10 @@ class ListWrapper<E> extends Collection<E> implements List<E> {
     return elements.remove(element);
   }
 
+  void insertAt(int index, E value) {
+    elements.insertAt(index, value);
+  }
+
   E removeAt(int index) {
     return elements.removeAt(index);
   }