Support for replacing of the context folder.

pkg/analysis_server/lib/src/context_manager.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 context.directory.manager;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:convert';
 import 'dart:core' hide Resource;
@@ skipping 317 matching lines @@
    */
   void applyChangesToContext(Folder contextFolder, ChangeSet changeSet);
 
   /**
    * Signals that the context manager has started to compute a package map (if
    * [computing] is `true`) or has finished (if [computing] is `false`).
    */
   void computingPackageMap(bool computing);
 
   /**
+   * Called when the context manager changes the folder with which a context is
+   * associated. Currently this is mostly FYI, and used only in tests.
+   */
+  void moveContext(Folder from, Folder to);
+
+  /**
    * Remove the context associated with the given [folder].  [flushedFiles] is
    * a list of the files which will be "orphaned" by removing this context
    * (they will no longer be analyzed by any context).
    */
   void removeContext(Folder folder, List<String> flushedFiles);
 
   /**
    * Called when the package resolution for the given [context] has changed.
    */
   void updateContextPackageUriResolver(AnalysisContext context);
@@ skipping 1440 matching lines @@
       ResourceProvider resourceProvider) {
     if (packages != null) {
       // Construct package map for the SdkExtUriResolver.
       Map<String, List<Folder>> packageMap = buildPackageMap(resourceProvider);
       return <UriResolver>[new SdkExtUriResolver(packageMap)];
     } else {
       return const <UriResolver>[];
     }
   }
 }