Serialize prefix members.

pkg/compiler/lib/src/serialization/element_serialization.dart

 // Copyright (c) 2015, 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.serialization.elements;
 
 import '../common.dart';
 import '../common/names.dart';
 import '../constants/constructors.dart';
 import '../constants/expressions.dart';
@@ skipping 709 matching lines @@
     }
     return null;
   }
 
   void serialize(PrefixElement element, ObjectEncoder encoder,
       SerializedElementKind kind) {
     encoder.setString(Key.NAME, element.name);
     encoder.setElement(Key.LIBRARY, element.library);
     encoder.setElement(Key.COMPILATION_UNIT, element.compilationUnit);
     encoder.setBool(Key.IS_DEFERRED, element.isDeferred);
+    Set<Element> members = new Set<Element>();
+    element.forEachLocalMember(SerializerUtil.flattenElements(members));
+    encoder.setElements(Key.MEMBERS, members);
     if (element.isDeferred) {
       encoder.setElement(Key.IMPORT, element.deferredImport);
       encoder.setElement(Key.GETTER, element.loadLibrary);
     }
   }
 }
 
 class DeferredLoadLibrarySerializer implements ElementSerializer {
   const DeferredLoadLibrarySerializer();
 
@@ skipping 128 matching lines @@
         return new WarnOnUseElementX(warning, info, enclosing, element);
       case SerializedElementKind.EXTERNAL_LIBRARY:
       case SerializedElementKind.EXTERNAL_LIBRARY_MEMBER:
       case SerializedElementKind.EXTERNAL_CLASS_MEMBER:
       case SerializedElementKind.EXTERNAL_CONSTRUCTOR:
         break;
     }
     throw new UnsupportedError("Unexpected element kind '${elementKind}.");
   }
 }