Add stub versions of KernelInferrerEngine and friends

pkg/compiler/lib/src/js_model/js_strategy.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 dart2js.js_model.strategy;
 
 import 'package:kernel/ast.dart' as ir;
 
 import '../closure.dart' show ClosureConversionTask;
 import '../common.dart';
 import '../common/tasks.dart';
 import '../common_elements.dart';
 import '../compiler.dart';
 import '../constants/constant_system.dart';
 import '../elements/entities.dart';
 import '../elements/types.dart';
 import '../enqueue.dart';
 import '../io/source_information.dart';
+import '../inferrer/kernel_inferrer_engine.dart';
 import '../js_emitter/sorter.dart';
 import '../js/js_source_mapping.dart';
 import '../js_backend/backend.dart';
 import '../js_backend/backend_usage.dart';
 import '../js_backend/constant_system_javascript.dart';
 import '../js_backend/interceptor_data.dart';
 import '../js_backend/native_data.dart';
 import '../js_backend/runtime_types.dart';
 import '../kernel/element_map.dart';
 import '../kernel/element_map_impl.dart';
 import '../kernel/kernel_backend_strategy.dart';
 import '../kernel/kernel_strategy.dart';
 import '../native/behavior.dart';
 import '../ssa/ssa.dart';
+import '../types/types.dart';
 import '../universe/class_set.dart';
 import '../universe/world_builder.dart';
 import '../util/emptyset.dart';
 import '../world.dart';
 import 'closure.dart';
 import 'elements.dart';
 import 'locals.dart';
 
 class JsBackendStrategy implements KernelBackendStrategy {
   final Compiler _compiler;
@@ skipping 296 matching lines @@
         closedWorld.elementEnvironment,
         nativeBasicData,
         closedWorld,
         selectorConstraintsStrategy);
   }
 
   @override
   SourceSpan spanFromSpannable(Spannable spannable, Entity currentElement) {
     return _elementMap.getSourceSpan(spannable, currentElement);
   }
+
+  @override
+  GlobalTypeInferenceResults createTypesInferrerResults(
+      TypesInferrer typesInferrer, ClosedWorld closedWorld) {
+    return new KernelGlobalTypeInferenceResults(typesInferrer, closedWorld);
+  }
+
+  @override
+  TypesInferrer createTypesInferrer(ClosedWorldRefiner closedWorldRefiner,
+      {bool disableTypeInference: false}) {
+    return new KernelTypeGraphInferrer(
+        _compiler, closedWorldRefiner.closedWorld, closedWorldRefiner,
+        disableTypeInference: disableTypeInference);
+  }
 }
 
 class JsClosedWorld extends ClosedWorldBase with KernelClosedWorldMixin {
   final JsKernelToElementMap elementMap;
   final RuntimeTypesNeed rtiNeed;
 
   JsClosedWorld(this.elementMap,
       {ElementEnvironment elementEnvironment,
       DartTypes dartTypes,
       CommonElements commonElements,
@@ skipping 65 matching lines @@
     node.isDirectlyInstantiated = true;
 
     return cls;
   }
 
   @override
   void registerClosureClass(ClassEntity cls) {
     throw new UnsupportedError('JsClosedWorld.registerClosureClass');
   }
 }