Add Closure call method to created closure class

pkg/compiler/lib/src/js_model/elements.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.elements;
 
+import '../common/names.dart' show Identifiers;
 import '../elements/entities.dart';
 import '../elements/names.dart';
 import '../elements/types.dart';
 import '../kernel/elements.dart';
 import '../kernel/element_map_impl.dart';
+import 'closure.dart' show KernelClosureClass;
 
 /// Map from 'frontend' to 'backend' elements.
 ///
 /// Frontend elements are what we read in, these typically represents concepts
 /// in Dart. Backend elements are what we generate, these may include elements
 /// that do not correspond to a Dart concept, such as closure classes.
 ///
 /// Querying for the frontend element for a backend-only element throws an
 /// exception.
 class JsToFrontendMap {
@@ skipping 489 matching lines @@
   JField(int memberIndex, JLibrary library, JClass enclosingClass, Name name,
       {bool isStatic, this.isAssignable, this.isConst})
       : super(memberIndex, library, enclosingClass, name, isStatic: isStatic);
 
   @override
   bool get isField => true;
 
   String get _kind => 'field';
 }
 
+class JClosureCallMethod extends JFunction {
+  JClosureCallMethod(int memberIndex, KernelClosureClass containingClass,
+      JFunction origClosureFunctionNode)
+      : super(
+            memberIndex,
+            containingClass.library,
+            containingClass,
+            new Name(Identifiers.call, containingClass.library),
+            origClosureFunctionNode.parameterStructure,
+            origClosureFunctionNode.asyncMarker);
+
+  String get _kind => 'closure_call';
+}
+
 class JTypeVariable implements TypeVariableEntity, IndexedTypeVariable {
   final int typeVariableIndex;
   final Entity typeDeclaration;
   final String name;
   final int index;
 
   JTypeVariable(
       this.typeVariableIndex, this.typeDeclaration, this.name, this.index);
 
   String toString() =>
       '${jsElementPrefix}type_variable(${typeDeclaration.name}.$name)';
 }