Move Index and IndexStore implementations into Engine.

pkg/analyzer/test/index/store/single_source_container.dart

Index: pkg/analyzer/test/index/store/single_source_container.dart
diff --git a/pkg/analysis_server/test/index/store/single_source_container.dart b/pkg/analyzer/test/index/store/single_source_container.dart
similarity index 89%
rename from pkg/analysis_server/test/index/store/single_source_container.dart
rename to pkg/analyzer/test/index/store/single_source_container.dart
index 4968217698834d7cbb02a626417b86ff5c889f17..e2b8f2ee7405d20e9868a4b45688b120920c728d 100644
--- a/pkg/analysis_server/test/index/store/single_source_container.dart
+++ b/pkg/analyzer/test/index/store/single_source_container.dart
@@ -2,7 +2,7 @@
 // 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.index.store_single_source_container;
+library test.engine.src.index.store_single_source_container;
 
 import 'package:analyzer/src/generated/source.dart';