Incremental compiler: Use addStubs for adding methods.

dart/pkg/compiler/lib/src/js_emitter/old_emitter/class_builder.dart

 // Copyright (c) 2013, 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 dart2js.js_emitter;
 
 /**
  * A data structure for collecting fragments of a class definition.
  */
 class ClassBuilder {
@@ skipping 16 matching lines @@
   jsAst.Property addProperty(String name, jsAst.Expression value) {
     jsAst.Property property = new jsAst.Property(js.string(name), value);
     properties.add(property);
     return property;
   }
 
   void addField(String field) {
     fields.add(field);
   }
 
-  jsAst.ObjectInitializer toObjectInitializer() {
+  jsAst.ObjectInitializer toObjectInitializer(
+      {bool omitClassDescriptor: false}) {
     StringBuffer buffer = new StringBuffer();
     if (superName != null) {
       buffer.write('$superName');
       if (functionType != null) {
         buffer.write(':$functionType');
       }
       buffer.write(';');
     }
     buffer.writeAll(fields, ',');
     var classData = js.string('$buffer');
     if (fieldMetadata != null) {
       // If we need to store fieldMetadata, classData is turned into an array,
       // and the field metadata is appended. So if classData is just a string,
       // there is no field metadata.
       classData =
           new jsAst.ArrayInitializer.from([classData]..addAll(fieldMetadata));
     }
-    var fieldsAndProperties =
-        [new jsAst.Property(js.string(namer.classDescriptorProperty),
-                            classData)]
-        ..addAll(properties);
+    List<jsAst.Property> fieldsAndProperties;
+    if (!omitClassDescriptor) {
+      fieldsAndProperties = <jsAst.Property>[];
+      fieldsAndProperties.add(
+          new jsAst.Property(
+              js.string(namer.classDescriptorProperty), classData));
+      fieldsAndProperties
+          ..addAll(properties);
+    } else {
+      fieldsAndProperties = properties;
+    }
     return new jsAst.ObjectInitializer(fieldsAndProperties, isOneLiner: false);
   }
-
 }