Record HAS_ANCESTOR relations into index.

pkg/analysis_server/lib/src/services/index/index.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 services.index;
 
 import 'dart:async';
 
 import 'package:analysis_server/analysis/index_core.dart';
 import 'package:analysis_server/src/services/index/indexable_element.dart';
@@ skipping 125 matching lines @@
   /**
    * Left: the Universe or a Library.
    *   Defines an Element.
    * Right: an Element declaration.
    */
   static final RelationshipImpl DEFINES =
       RelationshipImpl.getRelationship("defines");
 
   /**
    * Left: class.
+   *   Has ancestor (extended or implemented, directly or indirectly).
+   * Right: other class declaration.
+   */
+  static final RelationshipImpl HAS_ANCESTOR =
+      RelationshipImpl.getRelationship("has-ancestor");
+
+  /**
+   * Left: class.
    *   Is extended by.
    * Right: other class declaration.
    */
   static final RelationshipImpl IS_EXTENDED_BY =
       RelationshipImpl.getRelationship("is-extended-by");
 
   /**
    * Left: class.
    *   Is implemented by.
    * Right: other class declaration.
@@ skipping 196 matching lines @@
    */
   static RelationshipImpl getRelationship(String identifier) {
     RelationshipImpl relationship = _RELATIONSHIP_MAP[identifier];
     if (relationship == null) {
       relationship = new RelationshipImpl(identifier);
       _RELATIONSHIP_MAP[identifier] = relationship;
     }
     return relationship;
   }
 }