Replace try/finally with PerformanceTag.makeCurrentWhile().

pkg/analysis_server/lib/src/domain_execution.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 domain.execution;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_server/src/protocol.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/source.dart';
-import 'package:analyzer/src/generated/utilities_general.dart';
 
 /**
  * Instances of the class [ExecutionDomainHandler] implement a [RequestHandler]
  * that handles requests in the `execution` domain.
  */
 class ExecutionDomainHandler implements RequestHandler {
   /**
    * The analysis server that is using this handler to process requests.
    */
   final AnalysisServer server;
@@ skipping 125 matching lines @@
     } else {
       if (onFileAnalyzed != null) {
         onFileAnalyzed.cancel();
         onFileAnalyzed = null;
       }
     }
     return new ExecutionSetSubscriptionsResult().toResponse(request.id);
   }
 
   void _fileAnalyzed(ChangeNotice notice) {
-    PerformanceTag prevTag =
-        ServerPerformanceStatistics.executionNotifications.makeCurrent();
-    try {
+    ServerPerformanceStatistics.executionNotifications.makeCurrentWhile(() {
       Source source = notice.source;
       String filePath = source.fullName;
       if (!_isInAnalysisRoot(filePath)) {
         return;
       }
       AnalysisContext context = server.getAnalysisContext(filePath);
       if (AnalysisEngine.isDartFileName(filePath)) {
         ExecutableKind kind = ExecutableKind.NOT_EXECUTABLE;
         if (context.isClientLibrary(source)) {
           kind = ExecutableKind.CLIENT;
           if (context.isServerLibrary(source)) {
             kind = ExecutableKind.EITHER;
           }
         } else if (context.isServerLibrary(source)) {
           kind = ExecutableKind.SERVER;
         }
         server.sendNotification(
             new ExecutionLaunchDataParams(filePath, kind: kind).toNotification());
       } else if (AnalysisEngine.isHtmlFileName(filePath)) {
         List<Source> libraries = context.getLibrariesReferencedFromHtml(source);
         server.sendNotification(
             new ExecutionLaunchDataParams(
                 filePath,
                 referencedFiles: _getFullNames(libraries)).toNotification());
       }
-    } finally {
-      prevTag.makeCurrent();
-    }
+    });
   }
 
   /**
    * Return `true` if the given [filePath] represents a file that is in an
    * analysis root.
    */
   bool _isInAnalysisRoot(String filePath) =>
       server.contextDirectoryManager.isInAnalysisRoot(filePath);
 
   void _reportCurrentFileStatus() {
@@ skipping 38 matching lines @@
     if (_isInAnalysisRoot(filePath)) {
       server.sendNotification(
           new ExecutionLaunchDataParams(filePath, kind: kind).toNotification());
     }
   }
 
   static List<String> _getFullNames(List<Source> sources) {
     return sources.map((Source source) => source.fullName).toList();
   }
 }