Add timing of serialization

pkg/analysis_server/lib/src/channel/channel.dart

Index: pkg/analysis_server/lib/src/channel/channel.dart
diff --git a/pkg/analysis_server/lib/src/channel/channel.dart b/pkg/analysis_server/lib/src/channel/channel.dart
index 4e4ab2a11218dc83b9b8c23c553b24420dca998d..107b8b03e597050bbe4886a3fbc3229aab52a812 100644
--- a/pkg/analysis_server/lib/src/channel/channel.dart
+++ b/pkg/analysis_server/lib/src/channel/channel.dart
@@ -8,6 +8,7 @@ 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
@@ -45,6 +46,18 @@ abstract class ClientCommunicationChannel {
  */
 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