Add ClosureRepresentationInfo, the new public face of ClosureClassMap

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';
@@ skipping 313 matching lines @@
   @override
   ClosureAnalysisInfo getClosureAnalysisInfo(ir.Node node) {
     return const ClosureAnalysisInfo();
   }
 
   @override
   LoopClosureRepresentationInfo getClosureRepresentationInfoForLoop(
       ir.Node loopNode) {
     return const LoopClosureRepresentationInfo();
   }
+
+  @override
+  ClosureRepresentationInfo getClosureRepresentationInfo(Entity entity) {
+    return const ClosureRepresentationInfo();
+  }
 }
 
 class KernelSorter implements Sorter {
   final KernelToElementMapImpl elementMap;
 
   KernelSorter(this.elementMap);
 
   int _compareLibraries(LibraryEntity a, LibraryEntity b) {
     return utils.compareLibrariesUris(a.canonicalUri, b.canonicalUri);
   }
@@ skipping 29 matching lines @@
   Iterable<ClassEntity> sortClasses(Iterable<ClassEntity> classes) {
     return classes.toList()
       ..sort((ClassEntity a, ClassEntity b) {
         int r = _compareLibraries(a.library, b.library);
         if (r != 0) return r;
         return _compareNodes(
             a, elementMap.getClassNode(a), b, elementMap.getClassNode(b));
       });
   }
 }