Extract Dart specific node management into DartUnitIndexObjectManager.

pkg/analysis_server/test/services/index/dart_index_contributor_test.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 test.services.src.index.dart_index_contributor;
 
 import 'package:analysis_server/analysis/index/index_core.dart';
 import 'package:analysis_server/src/services/index/index.dart';
 import 'package:analysis_server/src/services/index/index_contributor.dart';
 import 'package:analysis_server/src/services/index/index_store.dart';
@@ skipping 51 matching lines @@
   List<RecordedRelation> recordedRelations = <RecordedRelation>[];
   List<Element> recordedTopElements = <Element>[];
 
   CompilationUnitElement importedUnit({int index: 0}) {
     List<ImportElement> imports = testLibraryElement.imports;
     return imports[index].importedLibrary.definingCompilationUnit;
   }
 
   void setUp() {
     super.setUp();
-    when(store.aboutToIndexDart(context, anyObject)).thenReturn(true);
+    when(store.aboutToIndex(context, anyObject)).thenReturn(true);
     when(store.recordRelationship(anyObject, anyObject, anyObject)).thenInvoke(
         (IndexableObject indexable, RelationshipImpl relationship,
             LocationImpl location) {
       recordedRelations
           .add(new RecordedRelation(indexable, relationship, location));
     });
     when(store.recordTopLevelDeclaration(anyObject))
         .thenInvoke((Element element) {
       recordedTopElements.add(element);
     });
@@ skipping 1556 matching lines @@
   RecordedRelation(this.indexable, this.relationship, this.location);
 
   @override
   String toString() {
     return 'RecordedRelation(indexable=$indexable; relationship=$relationship; '
         'location=$location; flags='
         '${location.isQualified ? "Q" : ""}'
         '${location.isResolved ? "R" : ""})';
   }
 }