Follow up to CL 764533002.

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

 // Copyright (c) 2011, 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.
 
 part of js_backend;
 
 /**
  * Assigns JavaScript identifiers to Dart variables, class-names and members.
  */
 class Namer implements ClosureNamer {
@@ skipping 972 matching lines @@
       return r'$or';
     } else if (name == '-') {
       return r'$sub';
     } else if (name == 'unary-') {
       return r'$negate';
     } else {
       return name;
     }
   }
 
+  String get incrementalHelperName => r'$dart_unsafe_eval';
+
+  jsAst.Expression get accessIncrementalHelper {
+    assert(compiler.hasIncrementalSupport);
+    return js('self.${incrementalHelperName}');
+  }
+
   void forgetElement(Element element) {
     String globalName = globals[element];
     invariant(element, globalName != null, message: 'No global name.');
     usedGlobalNames.remove(globalName);
     globals.remove(element);
   }
 }
 
 /**
  * Generator of names for [ConstantValue] values.
@@ skipping 377 matching lines @@
         if (!first) {
           sb.write('_');
         }
         sb.write('_');
         visit(parameter);
         first = true;
       }
     }
   }
 }