update the analyzer and analysis server perf tags

pkg/analyzer_cli/lib/src/perf_report.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 analyzer_cli.src.perf_report;
 
 import 'dart:convert' show JsonEncoder;
 import 'dart:io' show Platform;
 
 import 'package:analyzer/src/generated/utilities_general.dart'
@@ skipping 48 matching lines @@
     'showSdkWarnings': options.showSdkWarnings,
     'definedVariables': options.definedVariables,
     'packageRootPath': options.packageRootPath,
     'packageConfigPath': options.packageConfigPath,
     'sourceFiles': options.sourceFiles,
   };
 
   // Convert performance tags to JSON representation.
   var perfTagsJson = <String, dynamic>{};
   for (PerformanceTag tag in PerformanceTag.all) {
-    if (tag != PerformanceTag.UNKNOWN) {
+    if (tag != PerformanceTag.unknown) {
       int tagTime = tag.elapsedMs;
       perfTagsJson[tag.label] = tagTime;
       otherTime -= tagTime;
     }
   }
   perfTagsJson['other'] = otherTime;
 
   // Generate task table.
   var taskRows = <_TaskRow>[];
   int totalTaskTime = 0;
@@ skipping 23 matching lines @@
 }
 
 class _TaskRow {
   final String name;
   final int time;
   final int count;
   _TaskRow(this.name, this.time, this.count);
 
   Map toJson() => <String, dynamic>{'name': name, 'time': time, 'count': count};
 }