Add List.insert.

sdk/lib/web_sql/dart2js/web_sql_dart2js.dart

Index: sdk/lib/web_sql/dart2js/web_sql_dart2js.dart
diff --git a/sdk/lib/web_sql/dart2js/web_sql_dart2js.dart b/sdk/lib/web_sql/dart2js/web_sql_dart2js.dart
index ffdecb7c42653ef8901b508f36a758dfa86a81c4..46d1de62d6d8a92f00e5f882464e011508bfe531 100644
--- a/sdk/lib/web_sql/dart2js/web_sql_dart2js.dart
+++ b/sdk/lib/web_sql/dart2js/web_sql_dart2js.dart
@@ -383,6 +383,10 @@ class SqlResultSetRowList implements JavaScriptIndexingBehavior, List<Map> nativ
   Map max([int compare(Map a, Map b)]) =>
       IterableMixinWorkaround.max(this, compare);
 
+  void insert(int index, Map element) {
+    throw new UnsupportedError("Cannot add to immutable List.");
+  }
+
   Map removeAt(int pos) {
     throw new UnsupportedError("Cannot remove from immutable List.");
   }