Print min/max element in memory benchmarks.

pkg/analysis_server/benchmark/perf/memory_tests.dart

 // Copyright (c) 2016, 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.
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
+import 'dart:math';
 
 import 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:unittest/unittest.dart';
 
 import '../../test/integration/integration_tests.dart';
 
 void printMemoryResults(String id, String description, List<int> sizes) {
+  int minMemory = sizes.fold(sizes.first, min);
+  int maxMemory = sizes.fold(sizes.first, max);
   String now = new DateTime.now().toUtc().toIso8601String();
   print('$now ========== $id');
   print('memory: $sizes');
+  print('min_memory: $minMemory');
+  print('max_memory: $maxMemory');
   print(description.trim());
   print('--------------------');
   print('');
   print('');
 }
 
 /**
  * Base class for analysis server memory usage tests.
  */
 class AnalysisServerMemoryUsageTest
@@ skipping 88 matching lines @@
       // Set roots and analyze.
       await test.sendAnalysisSetAnalysisRoots(roots, []);
       await test.analysisFinished;
       sizes.add(test.getMemoryUsage());
       // Stop the server.
       await test.shutdown();
     }
     return sizes;
   }
 }