Add List.asMap().

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..91b4c163d8ef38f86b10c2a625de6e52d9ab17e7 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
@@ -315,6 +315,10 @@ class ListWrapper<E> extends Collection<E> implements List<E> {
   void insertRange(int start, int length, [E fill]) {
     elements.insertRange(start, length, fill);
   }
+
+  Map<int, E> asMap() {
+    return elements.asMap();
+  }
 }
 
 class JavaIterator<E> {