performance measurement mods:

pkg/analysis_server/benchmark/integration/operation.dart

 // Copyright (c) 2015, 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 server.operation;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/protocol.dart';
 import 'package:logging/logging.dart';
@@ skipping 151 matching lines @@
         if (text.endsWith('\n')) {
           text = text.substring(0, text.length - 1);
         }
         return text.replaceAll('\n', '\n  ');
       }
       String message = 'Request:${format(requestJson)}\n'
           'expected result:${format(expectedResult)}\n'
           'expected error:${format(expectedError)}\n'
           'but received:${format(actualResult)}';
       driver.results.recordUnexpectedResults(requestJson['method']);
+      converter.logOverlayContent();
       if (expectedError == null) {
         converter.logger.log(Level.SEVERE, message);
       } else {
         throw message;
       }
     }
   }
 }
 
 class StartServerOperation extends Operation {
-  final int diagnosticPort;
-
-  StartServerOperation({this.diagnosticPort});
-
   @override
   Future perform(Driver driver) {
-    return driver.startServer(diagnosticPort: diagnosticPort);
+    return driver.startServer();
   }
 }
 
 class WaitForAnalysisCompleteOperation extends Operation {
   @override
   Future perform(Driver driver) {
     DateTime start = new DateTime.now();
     driver.logger.log(Level.FINE, 'waiting for analysis to complete');
     StreamSubscription<ServerStatusParams> subscription;
     Timer timer;
@@ skipping 30 matching lines @@
         subscription.cancel();
         timer.cancel();
         String message = 'gave up waiting for analysis to complete';
         driver.logger.log(Level.WARNING, message);
         completer.completeError(message);
       }
     });
     return completer.future;
   }
 }