Fix analysis server to only send SERVER_STATUS when subscribed to.

pkg/analysis_server/lib/src/analysis_server.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 analysis.server;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:analyzer/file_system/file_system.dart';
@@ skipping 413 matching lines @@
         sendStatusNotification(null);
       }
     }
   }
 
   /**
    * Send status notification to the client. The `operation` is the operation
    * being performed or `null` if analysis is complete.
    */
   void sendStatusNotification(ServerOperation operation) {
+    // Only send status when subscribed.
+    if (!serverServices.contains(ServerService.STATUS)) {
+      return;
+    }
     // Only send status when it changes
     bool isAnalyzing = operation != null;
     if (statusAnalyzing == isAnalyzing) {
       return;
     }
     statusAnalyzing = isAnalyzing;
     Notification notification = new Notification(SERVER_STATUS);
     Map<String, Object> analysis = new HashMap();
     analysis['analyzing'] = isAnalyzing;
     notification.params['analysis'] = analysis;
@@ skipping 378 matching lines @@
 /**
  * An enumeration of the services provided by the server domain.
  */
 class ServerService extends Enum2<ServerService> {
   static const ServerService STATUS = const ServerService('STATUS', 0);
 
   static const List<ServerService> VALUES = const [STATUS];
 
   const ServerService(String name, int ordinal) : super(name, ordinal);
 }