Add ClosureClassMaps super interface for ClosureTask

pkg/compiler/lib/src/closure.dart

 // Copyright (c) 2012, 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 closureToClassMapper;
 
 import 'common/names.dart' show Identifiers;
 import 'common/resolution.dart' show ParsingContext, Resolution;
 import 'common/tasks.dart' show CompilerTask;
 import 'common.dart';
 import 'compiler.dart' show Compiler;
 import 'constants/expressions.dart';
 import 'elements/resolution_types.dart';
 import 'elements/elements.dart';
 import 'elements/entities.dart';
 import 'elements/modelx.dart'
     show BaseFunctionElementX, ClassElementX, ElementX;
 import 'elements/visitor.dart' show ElementVisitor;
 import 'js_backend/js_backend.dart' show JavaScriptBackend;
 import 'resolution/tree_elements.dart' show TreeElements;
 import 'package:front_end/src/fasta/scanner.dart' show Token;
 import 'tree/tree.dart';
 import 'util/util.dart';
 import 'world.dart' show ClosedWorldRefiner;
 
-class ClosureTask extends CompilerTask {
+abstract class ClosureClassMaps {
+  ClosureClassMap getMemberMap(MemberEntity member);
+  ClosureClassMap getLocalFunctionMap(Local localFunction);
+}
+
+class ClosureTask extends CompilerTask implements ClosureClassMaps {
   Map<Element, ClosureClassMap> _closureMappingCache =
       <Element, ClosureClassMap>{};
   Compiler compiler;
   ClosureTask(Compiler compiler)
       : compiler = compiler,
         super(compiler.measurer);
 
   String get name => "Closure Simplifier";
 
   DiagnosticReporter get reporter => compiler.reporter;
 
+  ClosureClassMap getMemberMap(MemberElement member) {
+    return getClosureToClassMapping(member.resolvedAst);
+  }
+
+  ClosureClassMap getLocalFunctionMap(LocalFunctionElement localFunction) {
+    return getClosureToClassMapping(localFunction.resolvedAst);
+  }
+
   /// Returns the [ClosureClassMap] computed for [resolvedAst].
   ClosureClassMap getClosureToClassMapping(ResolvedAst resolvedAst) {
     return measure(() {
       Element element = resolvedAst.element;
       if (element.isGenerativeConstructorBody) {
         ConstructorBodyElement constructorBody = element;
         element = constructorBody.constructor;
       }
       ClosureClassMap closureClassMap = _closureMappingCache[element];
       assert(invariant(resolvedAst.element, closureClassMap != null,
@@ skipping 1174 matching lines @@
 ///
 /// Move the below classes to a JS model eventually.
 ///
 abstract class JSEntity implements Entity {
   Entity get declaredEntity;
 }
 
 abstract class PrivatelyNamedJSEntity implements JSEntity {
   Entity get rootOfScope;
 }