Support for replacing of the context folder.

pkg/analysis_server/lib/src/analysis_server.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 analysis.server;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:core' hide Resource;
 import 'dart:math' show max;
@@ skipping 1565 matching lines @@
       }
       sendAnalysisNotificationFlushResults(analysisServer, flushedFiles);
     }
   }
 
   @override
   void computingPackageMap(bool computing) =>
       analysisServer._computingPackageMap(computing);
 
   @override
+  void moveContext(Folder from, Folder to) {
+    // There is nothing to do.
+    // This method is mostly for tests.
+    // Context managers manage folders and contexts themselves.
+  }
+
+  @override
   void removeContext(Folder folder, List<String> flushedFiles) {
     AnalysisContext context = analysisServer.folderMap.remove(folder);
     sendAnalysisNotificationFlushResults(analysisServer, flushedFiles);
 
     analysisServer.operationQueue.contextRemoved(context);
     analysisServer._onContextsChangedController
         .add(new ContextsChangedEvent(removed: [context]));
     analysisServer.sendContextAnalysisDoneNotifications(
         context, AnalysisDoneReason.CONTEXT_REMOVED);
     context.dispose();
@@ skipping 155 matching lines @@
   /**
    * The [PerformanceTag] for time spent in server request handlers.
    */
   static PerformanceTag serverRequests = new PerformanceTag('serverRequests');
 
   /**
    * The [PerformanceTag] for time spent in split store microtasks.
    */
   static PerformanceTag splitStore = new PerformanceTag('splitStore');
 }