Find native classes with mixins in NativeClassFinder

pkg/compiler/lib/src/native/enqueue.dart

 // Copyright (c) 2014, 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.
 
 import '../common_elements.dart' show CommonElements, ElementEnvironment;
 import '../elements/elements.dart';
 import '../elements/entities.dart';
 import '../elements/resolution_types.dart';
 import '../elements/types.dart';
 import '../js_backend/backend_usage.dart' show BackendUsageBuilder;
@@ skipping 181 matching lines @@
   final Set<ClassEntity> _nativeClasses = new Set<ClassEntity>();
 
   NativeResolutionEnqueuer(
       CompilerOptions options,
       ElementEnvironment elementEnvironment,
       CommonElements commonElements,
       this._backendUsageBuilder,
       this._nativeClassFinder)
       : super(options, elementEnvironment, commonElements);
 
+  Iterable<ClassEntity> get nativeClassesForTesting => _nativeClasses;
+
+  Iterable<ClassEntity> get registeredClassesForTesting => _registeredClasses;
+
   void _registerBackendUse(FunctionEntity element) {
     _backendUsageBuilder.registerBackendFunctionUse(element);
     _backendUsageBuilder.registerGlobalFunctionDependency(element);
   }
 
   WorldImpact processNativeClasses(Iterable<LibraryEntity> libraries) {
     WorldImpactBuilderImpl impactBuilder = new WorldImpactBuilderImpl();
     Iterable<ClassEntity> nativeClasses =
         _nativeClassFinder.computeNativeClasses(libraries);
     _nativeClasses.addAll(nativeClasses);
@@ skipping 89 matching lines @@
         emitter.directSubtypes.putIfAbsent(superclass, () => <ClassEntity>[]);
     directSubtypes.add(cls);
   }
 
   void logSummary(void log(String message)) {
     super.logSummary(log);
     log('Compiled ${_registeredClasses.length} native classes, '
         '${_unusedClasses.length} native classes omitted.');
   }
 }