Add support for a client id

pkg/analyzer/lib/instrumentation/instrumentation.dart

Index: pkg/analyzer/lib/instrumentation/instrumentation.dart
diff --git a/pkg/analyzer/lib/instrumentation/instrumentation.dart b/pkg/analyzer/lib/instrumentation/instrumentation.dart
index 5075dd8abf8d06259208bfb04658b199c9cd1c1a..d965cae624300a5a8fbe5d04c6f21bc04a0ad0e5 100644
--- a/pkg/analyzer/lib/instrumentation/instrumentation.dart
+++ b/pkg/analyzer/lib/instrumentation/instrumentation.dart
@@ -49,6 +49,7 @@ class InstrumentationService {
   static const String TAG_REQUEST = 'Req';
   static const String TAG_RESPONSE = 'Res';
   static const String TAG_VERSION = 'Ver';
+
   /**
    * The instrumentation server used to communicate with the server, or `null`
    * if instrumentation data should not be logged.
@@ -57,7 +58,7 @@ class InstrumentationService {
 
   /**
    * Initialize a newly created instrumentation service to comunicate with the
-   * given instrumentation server.
+   * given [instrumentationServer].
    */
   const InstrumentationService(this.instrumentationServer);