Add ClosureClassMaps super interface for ClosureTask

pkg/compiler/lib/src/kernel/kernel_backend_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.kernel.backend_strategy;
 
 import 'package:kernel/ast.dart' as ir;
 
 import '../backend_strategy.dart';
+import '../closure.dart';
 import '../common/codegen.dart' show CodegenRegistry, CodegenWorkItem;
 import '../common/tasks.dart';
 import '../compiler.dart';
 import '../elements/entities.dart';
 import '../enqueue.dart';
 import '../io/source_information.dart';
 import '../js_backend/backend.dart';
 import '../js_backend/native_data.dart';
 import '../js_emitter/sorter.dart';
 import '../kernel/element_map.dart';
+import '../kernel/element_map_impl.dart';
 import '../native/behavior.dart';
 import '../ssa/builder_kernel.dart';
 import '../ssa/nodes.dart';
 import '../ssa/ssa.dart';
 import '../ssa/types.dart';
 import '../types/types.dart';
 import '../universe/selector.dart';
 import '../universe/world_builder.dart';
 import '../universe/world_impact.dart';
 import '../world.dart';
@@ skipping 69 matching lines @@
     return _backend.codegen(this, _closedWorld);
   }
 }
 
 /// Task for building SSA from kernel IR loaded from .dill.
 class KernelSsaBuilderTask extends CompilerTask implements SsaBuilderTask {
   final Compiler _compiler;
 
   KernelSsaBuilderTask(this._compiler) : super(_compiler.measurer);
 
-  KernelToElementMap get _elementMap {
+  KernelToElementMapImpl get _elementMap {
     KernelFrontEndStrategy frontEndStrategy = _compiler.frontEndStrategy;
     return frontEndStrategy.elementMap;
   }
 
   @override
   HGraph build(CodegenWorkItem work, ClosedWorld closedWorld) {
     KernelSsaBuilder builder = new KernelSsaBuilder(
         work.element,
+        _elementMap.getMemberRoot(work.element),
         _compiler,
         _elementMap,
         new KernelToTypeInferenceMapImpl(closedWorld),
         closedWorld,
         work.registry,
+        const KernelClosureClassMaps(),
         const SourceInformationBuilder(),
-        null);
+        // TODO(johnniwinther): Support these:
+        null, // Function node used as capture scope id.
+        targetIsConstructorBody: false);
     return builder.build();
   }
 }
 
 class KernelToTypeInferenceMapImpl implements KernelToTypeInferenceMap {
   final ClosedWorld _closedWorld;
 
   KernelToTypeInferenceMapImpl(this._closedWorld);
 
   @override
@@ skipping 58 matching lines @@
   TypeMask typeOfInvocation(
       ir.MethodInvocation invocation, ClosedWorld closedWorld) {
     return _closedWorld.commonMasks.dynamicType;
   }
 
   @override
   TypeMask getReturnTypeOf(FunctionEntity function) {
     return _closedWorld.commonMasks.dynamicType;
   }
 }
+
+/// TODO(johnniwinther,efortuna): Implement this.
+class KernelClosureClassMaps implements ClosureClassMaps {
+  const KernelClosureClassMaps();
+
+  @override
+  ClosureClassMap getLocalFunctionMap(Local localFunction) {
+    return new ClosureClassMap(null, null, null, null);
+  }
+
+  @override
+  ClosureClassMap getMemberMap(MemberEntity member) {
+    return new ClosureClassMap(null, null, null, null);
+  }
+}