Introduce TypedefEntity

pkg/compiler/lib/src/kernel/element_map_impl.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.element_map;
 
 import 'package:kernel/ast.dart' as ir;
 
 import '../common.dart';
 import '../common/names.dart' show Identifiers;
@@ skipping 1247 matching lines @@
   bool isDeferredLoadLibraryGetter(MemberEntity member) {
     // TODO(redemption): Support these.
     return false;
   }
 
   @override
   Iterable<ConstantValue> getMemberMetadata(covariant IndexedMember member) {
     MemberData memberData = elementMap._memberData[member.memberIndex];
     return memberData.getMetadata(elementMap);
   }
+
+  @override
+  FunctionType getFunctionTypeOfTypedef(TypedefEntity typedef) {
+    // TODO(redemption): Support this.
+    throw new UnsupportedError('ElementEnvironment.getTypedefAlias');
+  }
 }
 
 /// Visitor that converts kernel dart types into [DartType].
 class DartTypeConverter extends ir.DartTypeVisitor<DartType> {
   final KernelToElementMapBase elementMap;
   bool topLevel = true;
 
   DartTypeConverter(this.elementMap);
 
   DartType convert(ir.DartType type) {
@@ skipping 294 matching lines @@
       ConstantSystem constantSystem,
       NativeData nativeData,
       InterceptorData interceptorData,
       BackendUsage backendUsage,
       ResolutionWorldBuilder resolutionWorldBuilder,
       RuntimeTypesNeedBuilder rtiNeedBuilder,
       Set<ClassEntity> implementedClasses,
       Iterable<ClassEntity> liveNativeClasses,
       Iterable<MemberEntity> liveInstanceMembers,
       Iterable<MemberEntity> assignedInstanceMembers,
-      Set<TypedefElement> allTypedefs,
+      Set<TypedefEntity> allTypedefs,
       Map<ClassEntity, Set<ClassEntity>> mixinUses,
       Map<ClassEntity, Set<ClassEntity>> typesImplementedBySubclasses,
       Map<ClassEntity, ClassHierarchyNode> classHierarchyNodes,
       Map<ClassEntity, ClassSet> classSets})
       : super(
             elementEnvironment,
             dartTypes,
             commonElements,
             constantSystem,
             nativeData,
@@ skipping 328 matching lines @@
       if (data.constructorBody != null) {
         f(data.constructorBody);
       }
     });
   }
 
   String getDeferredUri(ir.LibraryDependency node) {
     throw new UnimplementedError('JsKernelToElementMap.getDeferredUri');
   }
 }