Support creating elements from IR nodes in JsKernelToElementMap

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 '../closure.dart' show ClosureConversionTask;
 import '../common/tasks.dart';
 import '../common_elements.dart';
 import '../compiler.dart';
@@ skipping 96 matching lines @@
     }
 
     closedWorld
         .getClassHierarchyNode(closedWorld.commonElements.objectClass)
         .forEachSubclass((ClassEntity cls) {
       convertClassSet(closedWorld.getClassSet(cls));
     }, ClassHierarchyNode.ALL);
 
     return new JsClosedWorld(
         elementEnvironment: _elementEnvironment,
+        dartTypes: _elementMap.types,
         commonElements: _commonElements,
         constantSystem: const JavaScriptConstantSystem(),
         backendUsage: backendUsage,
         nativeData: nativeData,
         interceptorData: interceptorData,
         classHierarchyNodes: classHierarchyNodes,
         classSets: classSets,
         implementedClasses: implementedClasses,
-        // TODO(johnniwinther): Support this.
-        allTypedefs: new ImmutableEmptySet<TypedefElement>());
+        // TODO(johnniwinther): Support these.
+        allTypedefs: new ImmutableEmptySet<TypedefElement>(),
+        resolutionWorldBuilder: null,
+        functionSet: null,
+        mixinUses: null,
+        typesImplementedBySubclasses: null);
   }
 
   @override
   Sorter get sorter {
     return _sorter ??= new KernelSorter(elementMap);
   }
 
   @override
   ClosureConversionTask get closureDataLookup =>
       _closureDataLookup ??= new KernelClosureConversionTask(
@@ skipping 21 matching lines @@
       ClosedWorld closedWorld,
       SelectorConstraintsStrategy selectorConstraintsStrategy) {
     return new KernelCodegenWorldBuilder(
         elementMap,
         closedWorld.elementEnvironment,
         nativeBasicData,
         closedWorld,
         selectorConstraintsStrategy);
   }
 }