Add model test of CodegenWorldBuilder to compile_from_dill_test

tests/compiler/dart2js/kernel/compile_from_dill_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.compile_from_dill_test;
 
 import 'dart:async';
 import 'dart:io';
 
 import 'package:async_helper/async_helper.dart';
 import 'package:compiler/compiler_new.dart';
 import 'package:compiler/src/commandline_options.dart';
 import 'package:compiler/src/common.dart';
 import 'package:compiler/src/compiler.dart';
 import 'package:compiler/src/elements/resolution_types.dart';
 import 'package:compiler/src/elements/types.dart';
-import 'package:compiler/src/enqueue.dart';
 import 'package:compiler/src/kernel/element_map.dart';
 import 'package:compiler/src/kernel/kernel_strategy.dart';
 import 'package:compiler/src/serialization/equivalence.dart';
 import 'package:compiler/src/resolution/enum_creator.dart';
 import 'package:compiler/src/universe/world_builder.dart';
 import 'package:compiler/src/world.dart';
 import 'package:expect/expect.dart';
 import '../memory_compiler.dart';
 import '../equivalence/check_functions.dart';
 import '../equivalence/check_helpers.dart';
@@ skipping 57 matching lines @@
   }
   if (collector.errors.isNotEmpty && skipErrors) {
     print('Skipping due to errors.');
     return ResultKind.errors;
   }
   if (collector.warnings.isNotEmpty && skipWarnings) {
     print('Skipping due to warnings.');
     return ResultKind.warnings;
   }
   Expect.isFalse(compiler1.compilationFailed);
-  ResolutionEnqueuer enqueuer1 = compiler1.enqueuer.resolution;
   ClosedWorld closedWorld1 =
       compiler1.resolutionWorldBuilder.closedWorldForTesting;
 
   OutputCollector collector2 = new OutputCollector();
   Compiler compiler2 = await compileWithDill(entryPoint, const {},
       [Flags.disableTypeInference, Flags.enableAssertMessage],
       printSteps: true, compilerOutput: collector2);
 
   KernelFrontEndStrategy frontEndStrategy = compiler2.frontEndStrategy;
   KernelToElementMap elementMap = frontEndStrategy.elementMap;
 
   Expect.isFalse(compiler2.compilationFailed);
 
   KernelEquivalence equivalence = new KernelEquivalence(elementMap);
 
-  ResolutionEnqueuer enqueuer2 = compiler2.enqueuer.resolution;
   ClosedWorld closedWorld2 =
       compiler2.resolutionWorldBuilder.closedWorldForTesting;
 
   checkBackendUsage(closedWorld1.backendUsage, closedWorld2.backendUsage,
       equivalence.defaultStrategy);
 
   checkResolutionEnqueuers(closedWorld1.backendUsage, closedWorld2.backendUsage,
-      enqueuer1, enqueuer2, elementEquivalence: equivalence.entityEquivalence,
+      compiler1.enqueuer.resolution, compiler2.enqueuer.resolution,
+      elementEquivalence: equivalence.entityEquivalence,
       typeEquivalence: (ResolutionDartType a, DartType b) {
     return equivalence.typeEquivalence(unalias(a), b);
   }, elementFilter: elementFilter, verbose: arguments.verbose);
 
   checkClosedWorlds(closedWorld1, closedWorld2,
       strategy: equivalence.defaultStrategy,
       verbose: arguments.verbose,
       // TODO(johnniwinther,efortuna): Require closure class equivalence when
       // these are supported.
       allowMissingClosureClasses: true);
 
   // TODO(johnniwinther): Perform equivalence tests on the model: codegen world
-  // impacts, codegen world builder, etc.
+  // impacts, program model, etc.
+
+  checkCodegenEnqueuers(compiler1.enqueuer.codegenEnqueuerForTesting,
+      compiler2.enqueuer.codegenEnqueuerForTesting,
+      elementEquivalence: equivalence.entityEquivalence,
+      typeEquivalence: (ResolutionDartType a, DartType b) {
+    return equivalence.typeEquivalence(unalias(a), b);
+  }, elementFilter: elementFilter, verbose: arguments.verbose);
 
   collector1.outputMap
       .forEach((OutputType outputType, Map<String, BufferedOutputSink> map1) {
     if (outputType == OutputType.sourceMap) {
       // TODO(johnniwinther): Support source map from .dill.
       return;
     }
     Map<String, BufferedOutputSink> map2 = collector2.outputMap[outputType];
     checkSets(map1.keys, map2.keys, 'output', equality);
     map1.forEach((String name, BufferedOutputSink output1) {
       BufferedOutputSink output2 = map2[name];
       Expect.stringEquals(output1.text, output2.text);
     });
   });
   return ResultKind.success;
 }