Towards compiling Hello World!

pkg/compiler/lib/src/js_model/js_strategy.dart

 // Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library dart2js.js_model.strategy;
 
 import '../backend_strategy.dart';
 import '../closure.dart' show ClosureConversionTask;
 import '../common/tasks.dart';
 import '../common_elements.dart';
@@ skipping 125 matching lines @@
   @override
   WorkItemBuilder createCodegenWorkItemBuilder(ClosedWorld closedWorld) {
     return new KernelCodegenWorkItemBuilder(_compiler.backend, closedWorld);
   }
 
   @override
   CodegenWorldBuilder createCodegenWorldBuilder(
       NativeBasicData nativeBasicData,
       ClosedWorld closedWorld,
       SelectorConstraintsStrategy selectorConstraintsStrategy) {
-    return new KernelCodegenWorldBuilder(closedWorld.elementEnvironment,
-        nativeBasicData, closedWorld, selectorConstraintsStrategy);
+    KernelFrontEndStrategy frontendStrategy = _compiler.frontendStrategy;
+    return new KernelCodegenWorldBuilder(
+        frontendStrategy.elementMap,
+        closedWorld.elementEnvironment,
+        nativeBasicData,
+        closedWorld,
+        selectorConstraintsStrategy);
   }
 }