Support refresh of individual analysis roots (issue 22254)

pkg/analysis_server/test/analysis/reanalyze_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.analysis.reanalyze;
 
 import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_server/src/protocol.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:unittest/unittest.dart';
@@ skipping 41 matching lines @@
       server.updateContent('1', {testFile: new AddContentOverlay('main() {')});
       return waitForTasksFinished();
     }).then((_) {
       // Verify that the syntax error was detected.
       List<AnalysisError> errors = filesErrors[testFile];
       expect(errors, hasLength(1));
       // Remove testFile from filesErrors so that we'll notice when the file is
       // re-analyzed.
       filesErrors.remove(testFile);
       // Reanalyze.
-      server.reanalyze();
+      server.reanalyze(null);
       return waitForTasksFinished();
     }).then((_) {
       // The file should have been reanalyzed.
       expect(filesErrors, contains(testFile));
       // Verify that the syntax error is present (this indicates that the
       // content introduced by the call to updateContent is still in effect).
       List<AnalysisError> errors = filesErrors[testFile];
       expect(errors, hasLength(1));
     });
   }
 }