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 72bdc99c952196a2ab12d939c9c96fae1b7f711b..2e7a665f255f0a336e269e2edbce8b9d5d02263d 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
@@ -296,6 +296,10 @@ class ListWrapper<E> extends Collection<E> implements List<E> {
     return elements.remove(element);
   }
 
+  void insert(int index, E value) {
+    elements.insert(index, value);
+  }
+
   E removeAt(int index) {
     return elements.removeAt(index);
   }