Add kernel/closed_world2_test

pkg/compiler/lib/src/common/backend_api.dart

 // Copyright (c) 2012, 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.backend_api;
 
 import '../common/resolution.dart' show ResolutionImpact;
 import '../constants/expressions.dart' show ConstantExpression;
 import '../elements/types.dart';
 import '../elements/resolution_types.dart'
     show ResolutionDartType, ResolutionInterfaceType;
 import '../elements/entities.dart';
-import '../enqueue.dart' show ResolutionEnqueuer;
 import '../serialization/serialization.dart'
     show DeserializerPlugin, SerializerPlugin;
 import '../tree/tree.dart' show Node;
 import '../universe/world_impact.dart' show WorldImpact;
 
 /// Interface for resolving native data for a target specific element.
 abstract class NativeRegistry {
   /// Registers [nativeData] as part of the resolution impact.
   void registerNativeData(dynamic nativeData);
 }
@@ skipping 13 matching lines @@
 
 /// Target-specific transformation for resolution world impacts.
 ///
 /// This processes target-agnostic [ResolutionImpact]s and creates [WorldImpact]
 /// in which backend/target specific impact data is added, for example: if
 /// certain feature is used that requires some helper code from the backend
 /// libraries, this will be included by the impact transformer.
 class ImpactTransformer {
   /// Transform the [ResolutionImpact] into a [WorldImpact] adding the
   /// backend dependencies for features used in [worldImpact].
-  WorldImpact transformResolutionImpact(
-      ResolutionEnqueuer enqueuer, ResolutionImpact worldImpact) {
+  WorldImpact transformResolutionImpact(ResolutionImpact worldImpact) {
     return worldImpact;
   }
 }
 
 /// Interface for serialization of backend specific data.
 class BackendSerialization {
   const BackendSerialization();
 
   SerializerPlugin get serializer => const SerializerPlugin();
   DeserializerPlugin get deserializer => const DeserializerPlugin();
@@ skipping 120 matching lines @@
   InterfaceType getConstantMapTypeFor(InterfaceType sourceType,
       {bool hasProtoKey: false, bool onlyStringKeys: false});
 
   /// Returns the type of the constant symbol implementation class.
   InterfaceType get symbolType;
 
   /// Returns the field of the constant symbol implementation class that holds
   /// its internal name.
   FieldEntity get symbolField;
 }