Use package: URIs for files in lib

pkg/analysis_server/test/context_manager_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.context.directory.manager;
 
 import 'package:analysis_server/src/context_manager.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
 import 'package:analyzer/source/package_map_provider.dart';
@@ skipping 789 matching lines @@
   TestContextManager(MemoryResourceProvider resourceProvider,
       PackageMapProvider packageMapProvider)
       : super(resourceProvider, packageMapProvider);
 
   /**
    * Iterable of the paths to contexts that currently exist.
    */
   Iterable<String> get currentContextPaths => currentContextTimestamps.keys;
 
   @override
-  void addContext(Folder folder, UriResolver packageUriResolver) {
+  AnalysisContext addContext(Folder folder, UriResolver packageUriResolver) {
     String path = folder.path;
     expect(currentContextPaths, isNot(contains(path)));
     currentContextTimestamps[path] = now;
     currentContextFilePaths[path] = <String, int>{};
     currentContextPackageUriResolvers[path] = packageUriResolver;
+    return null;
   }
 
   @override
   void applyChangesToContext(Folder contextFolder, ChangeSet changeSet) {
     Map<String, int> filePaths = currentContextFilePaths[contextFolder.path];
     for (Source source in changeSet.addedSources) {
       expect(filePaths, isNot(contains(source.fullName)));
       filePaths[source.fullName] = now;
     }
     for (Source source in changeSet.removedSources) {
@@ skipping 23 matching lines @@
     currentContextFilePaths.remove(path);
     currentContextPackageUriResolvers.remove(path);
   }
 
   @override
   void updateContextPackageUriResolver(Folder contextFolder,
       UriResolver packageUriResolver) {
     currentContextPackageUriResolvers[contextFolder.path] = packageUriResolver;
   }
 }