Add List.insert.

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

 library java.core;
 
 import "dart:math" as math;
 import "dart:uri";
 
 class JavaSystem {
   static int currentTimeMillis() {
     return (new DateTime.now()).millisecondsSinceEpoch;
   }
 
@@ skipping 272 matching lines @@
   }
 
   void clear() {
     elements.clear();
   }
 
   void remove(Object element) {
     return elements.remove(element);
   }
 
+  void insertAt(int index, E value) {
+    elements.insertAt(index, value);
+  }
+
   E removeAt(int index) {
     return elements.removeAt(index);
   }
 
   E removeLast() {
     return elements.removeLast();
   }
 
   Iterable<E> get reversed => elements.reversed;
 
@@ skipping 72 matching lines @@
     return true;
   }
   return false;
 }
 
 void javaMapPutAll(Map target, Map source) {
   source.forEach((k, v) {
     target[k] = v;
   });
 }