`this` in js-cps.

pkg/compiler/lib/src/js_backend/codegen/codegen.dart

 // Copyright (c) 2014, 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 code_generator;
 
 import 'glue.dart';
 
 import '../../tree_ir/tree_ir_nodes.dart' as tree_ir;
 import '../../js/js.dart' as js;
@@ skipping 182 matching lines @@
   }
 
   @override
   js.Expression visitReifyTypeVar(tree_ir.ReifyTypeVar node) {
     return giveup(node);
     // TODO: implement visitReifyTypeVar
   }
 
   @override
   js.Expression visitThis(tree_ir.This node) {
-    return giveup(node);
-    // TODO: implement visitThis
+    // TODO(sigurdm): Inside a js closure this will not work.
+    return new js.This();
   }
 
   @override
   js.Expression visitTypeOperator(tree_ir.TypeOperator node) {
     return giveup(node);
     // TODO: implement visitTypeOperator
   }
 
   @override
   js.Expression visitVariable(tree_ir.Variable node) {
@@ skipping 68 matching lines @@
   @override
   void visitReturn(tree_ir.Return node) {
     if (node.value != null) {
       accumulator.add(new js.Return(visitExpression(node.value)));
     }
   }
 
   bool isNullLiteral(js.Expression exp) => exp is js.LiteralNull;
 
 }