Use IndexContributor(s) in LocalIndex.

pkg/analysis_server/test/services/index/dart_index_contributor_test.dart

Index: pkg/analysis_server/test/services/index/dart_index_contributor_test.dart
diff --git a/pkg/analysis_server/test/services/index/dart_index_contributor_test.dart b/pkg/analysis_server/test/services/index/dart_index_contributor_test.dart
index 022a7c9e0a7aa5cb62152149d4450f3057e85c0e..4cfd8cdcf3a3f54b076a8efefed418b53f768ef4 100644
--- a/pkg/analysis_server/test/services/index/dart_index_contributor_test.dart
+++ b/pkg/analysis_server/test/services/index/dart_index_contributor_test.dart
@@ -4,13 +4,14 @@
 
 library test.services.src.index.dart_index_contributor;
 
-import 'package:analysis_server/analysis/index/index_core.dart';
+import 'package:analysis_server/analysis/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';
 import 'package:analysis_server/src/services/index/indexable_element.dart';
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart';
+import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 import 'package:typed_mock/typed_mock.dart';
@@ -24,6 +25,11 @@ main() {
   defineReflectiveTests(DartUnitContributorTest);
 }
 
+void indexDartUnit(
+    InternalIndexStore store, AnalysisContext context, CompilationUnit unit) {
+  new DartIndexContributor().contributeTo(store, context, unit);
+}
+
 /**
  * Returns `true` if the [actual] location the same properties as [expected].
  */