Find native classes with mixins in NativeClassFinder

tests/compiler/dart2js/kernel/closed_world2_test.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.
 
 // Partial test that the closed world computed from [WorldImpact]s derived from
 // kernel is equivalent to the original computed from resolution.
 library dart2js.kernel.closed_world2_test;
 
 import 'dart:async';
 
@@ skipping 146 matching lines @@
   Expect.isFalse(compiler2.compilationFailed);
 
   KernelEquivalence equivalence = new KernelEquivalence(elementMap);
 
   ElementEnvironment environment2 = compiler2.elementEnvironment;
   checkElementEnvironment(environment1, environment2, equivalence);
 
   ResolutionEnqueuer enqueuer2 = compiler2.enqueuer.resolution;
   BackendUsage backendUsage2 = compiler2.backend.backendUsage;
   ClosedWorld closedWorld2 = compiler2.resolutionWorldBuilder.closeWorld();
+
+  checkNativeClasses(compiler1, compiler2, equivalence);
+
   checkBackendUsage(backendUsage1, backendUsage2, equivalence);
 
   checkResolutionEnqueuers(backendUsage1, backendUsage2, enqueuer1, enqueuer2,
       elementEquivalence: equivalence.entityEquivalence,
       typeEquivalence: (ResolutionDartType a, DartType b) {
     return equivalence.typeEquivalence(unalias(a), b);
   }, elementFilter: elementFilter, verbose: arguments.verbose);
 
   checkClosedWorlds(closedWorld1, closedWorld2, equivalence.entityEquivalence,
       verbose: arguments.verbose);
 
   return ResultKind.success;
 }
 
+void checkNativeClasses(
+    Compiler compiler1, Compiler compiler2, KernelEquivalence equivalence) {
+  Iterable<ClassEntity> nativeClasses1 = compiler1
+      .backend.nativeResolutionEnqueuerForTesting.nativeClassesForTesting;
+  Iterable<ClassEntity> nativeClasses2 = compiler2
+      .backend.nativeResolutionEnqueuerForTesting.nativeClassesForTesting;
+
+  checkSetEquivalence(compiler1, compiler2, 'nativeClasses', nativeClasses1,
+      nativeClasses2, equivalence.entityEquivalence);
+
+  Iterable<ClassEntity> registeredClasses1 = compiler1
+      .backend.nativeResolutionEnqueuerForTesting.registeredClassesForTesting;
+  Iterable<ClassEntity> registeredClasses2 = compiler2
+      .backend.nativeResolutionEnqueuerForTesting.registeredClassesForTesting;
+
+  checkSetEquivalence(compiler1, compiler2, 'registeredClasses',
+      registeredClasses1, registeredClasses2, equivalence.entityEquivalence);
+}
+
 void checkNativeBasicData(NativeBasicDataImpl data1, NativeBasicDataImpl data2,
     KernelEquivalence equivalence) {
   checkMapEquivalence(
       data1,
       data2,
       'nativeClassTagInfo',
       data1.nativeClassTagInfo,
       data2.nativeClassTagInfo,
       equivalence.entityEquivalence,
       (a, b) => a == b);
@@ skipping 87 matching lines @@
 
       classes2.add(cls2);
     });
     env2.forEachClass(lib2, (ClassEntity cls2) {
       Expect.isTrue(classes2.contains(cls2), "Extra class $cls2 in $lib2");
     });
   });
 
   // TODO(johnniwinther): Test the remaining properties of [ElementEnvironment].
 }