Add timing of serialization

pkg/analysis_server/lib/src/channel/channel.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 channel;
 
 import 'dart:async';
 import 'dart:convert';
 
 import 'package:analysis_server/src/protocol.dart';
+import 'package:analyzer/src/util/utilities_timing.dart';
 
 /**
  * The abstract class [ClientCommunicationChannel] defines the behavior of
  * objects that allow a client to send [Request]s to an [AnalysisServer] and to
  * receive both [Response]s and [Notification]s.
  */
 abstract class ClientCommunicationChannel {
   /**
    * The stream of notifications from the server.
    */
@@ skipping 17 matching lines @@
   Future close();
 }
 
 /**
  * The abstract class [ServerCommunicationChannel] defines the behavior of
  * objects that allow an [AnalysisServer] to receive [Request]s and to return
  * both [Response]s and [Notification]s.
  */
 abstract class ServerCommunicationChannel {
   /**
+   * A stopwatch used to accumulate the amount of time spent converting
+   * incomming requests from Json to objects.
+   */
+  static final CountedStopwatch FromJson = new CountedStopwatch();
+
+  /**
+   * A stopwatch used to accumulate the amount of time spent converting outgoing
+   * responses and notifications from objects to Json.
+   */
+  static final CountedStopwatch ToJson = new CountedStopwatch();
+
+  /**
    * Listen to the channel for requests. If a request is received, invoke the
    * [onRequest] function. If an error is encountered while trying to read from
    * the socket, invoke the [onError] function. If the socket is closed by the
    * client, invoke the [onDone] function.
    * Only one listener is allowed per channel.
    */
   void listen(void onRequest(Request request), {Function onError, void onDone()});
 
   /**
    * Send the given [notification] to the client.
@@ skipping 84 matching lines @@
       }
     }
   }
 
   @override
   void close() {
     closed = true;
     sink.close();
   }
 }