Add a flag/options for enabling incremental resolution validation.

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 'package:analysis_server/src/analysis_logger.dart';
@@ skipping 181 matching lines @@
       PackageMapProvider packageMapProvider, this.index,
       AnalysisServerOptions analysisServerOptions, this.defaultSdk,
       this.instrumentationService, {this.rethrowExceptions: true}) {
     searchEngine = createSearchEngine(index);
     operationQueue = new ServerOperationQueue(this);
     contextDirectoryManager =
         new ServerContextManager(this, resourceProvider, packageMapProvider);
     contextDirectoryManager.defaultOptions.incremental = true;
     contextDirectoryManager.defaultOptions.incrementalApi =
         analysisServerOptions.enableIncrementalResolutionApi;
+    contextDirectoryManager.defaultOptions.incrementalValidation =
+        analysisServerOptions.enableIncrementalResolutionValidation;
     AnalysisEngine.instance.logger = new AnalysisLogger();
     _onAnalysisStartedController = new StreamController.broadcast();
     _onAnalysisCompleteController = new StreamController.broadcast();
     _onFileAnalyzedController = new StreamController.broadcast();
     _onPriorityChangeController =
         new StreamController<PriorityChangeEvent>.broadcast();
     running = true;
     Notification notification = new ServerConnectedParams().toNotification();
     channel.sendNotification(notification);
     channel.listen(handleRequest, onDone: done, onError: error);
@@ skipping 725 matching lines @@
         new ServerErrorParams(
             true,
             exceptionString,
             stackTraceString).toNotification());
   }
 }
 
 
 class AnalysisServerOptions {
   bool enableIncrementalResolutionApi = false;
+  bool enableIncrementalResolutionValidation = false;
 }
 
 /**
  * A [ContextsChangedEvent] indicate what contexts were added or removed.
  *
  * No context should be added to the event more than once. It does not make
  * sense, for example, for a context to be both added and removed.
  */
 class ContextsChangedEvent {
 
@@ skipping 119 matching lines @@
    * [packageUriResolver].
    */
   SourceFactory _createSourceFactory(UriResolver packageUriResolver) {
     List<UriResolver> resolvers = <UriResolver>[
         new DartUriResolver(analysisServer.defaultSdk),
         new ResourceUriResolver(resourceProvider),
         packageUriResolver];
     return new SourceFactory(resolvers);
   }
 }