Add ClosureClassMaps super interface for ClosureTask

pkg/compiler/lib/src/js_backend/interceptor_data.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 js_backend.interceptor_data;
 
 import '../common/names.dart' show Identifiers;
 import '../common_elements.dart' show CommonElements, ElementEnvironment;
-import '../elements/elements.dart' show MemberElement;
+import '../elements/elements.dart' show ConstructorBodyElement;
 import '../elements/entities.dart';
 import '../elements/types.dart';
 import '../js/js.dart' as jsAst;
 import '../types/types.dart' show TypeMask;
 import '../universe/selector.dart';
 import '../world.dart' show ClosedWorld;
 import 'namer.dart';
 import 'native_data.dart';
 
 abstract class InterceptorData {
@@ skipping 62 matching lines @@
 
   final Set<ClassEntity> _noClasses = new Set<ClassEntity>();
 
   InterceptorDataImpl(
       this._nativeData,
       this._commonElements,
       this._interceptedElements,
       this._interceptedClasses,
       this._classesMixedIntoInterceptedClasses);
 
-  bool isInterceptedMethod(MemberElement element) {
+  bool isInterceptedMethod(MemberEntity element) {
     if (!element.isInstanceMember) return false;
-    if (element.isGenerativeConstructorBody) {
+    // TODO(johnniwinther): Avoid this hack.
+    if (element is ConstructorBodyElement) {
       return _nativeData.isNativeOrExtendsNative(element.enclosingClass);
     }
     return _interceptedElements[element.name] != null;
   }
 
   bool fieldHasInterceptedGetter(FieldEntity element) {
     return _interceptedElements[element.name] != null;
   }
 
   bool fieldHasInterceptedSetter(FieldEntity element) {
@@ skipping 229 matching lines @@
     jsAst.Name name = namer.nameForGetInterceptor(classes);
     if (classes.contains(_commonElements.jsInterceptorClass)) {
       // We can't use a specialized [getInterceptorMethod], so we make
       // sure we emit the one with all checks.
       _specializedGetInterceptors[name] = _interceptorData.interceptedClasses;
     } else {
       _specializedGetInterceptors[name] = classes;
     }
   }
 }