Adds PID to `server.connected` notification (#26744).

pkg/analysis_server/test/integration/integration_test_methods.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.
 //
 // This file has been automatically generated.  Please do not edit it manually.
 // To regenerate the file, use the script
 // "pkg/analysis_server/tool/spec/generate_files".
 
 /**
  * Convenience methods for running integration tests
@@ skipping 76 matching lines @@
    * the server has started running but before any requests are processed to
    * let the client know that it started correctly.
    *
    * It is not possible to subscribe to or unsubscribe from this notification.
    *
    * Parameters
    *
    * version ( String )
    *
    *   The version number of the analysis server.
+   *
+   * pid ( String )
+   *
+   *   The process id of the analysis server process.
    */
   Stream<ServerConnectedParams> onServerConnected;
 
   /**
    * Stream controller for [onServerConnected].
    */
   StreamController<ServerConnectedParams> _onServerConnected;
 
   /**
    * Reports that an unexpected error has occurred while executing the server.
@@ skipping 1695 matching lines @@
       case "execution.launchData":
         expect(params, isExecutionLaunchDataParams);
         _onExecutionLaunchData.add(new ExecutionLaunchDataParams.fromJson(decoder, 'params', params));
         break;
       default:
         fail('Unexpected notification: $event');
         break;
     }
   }
 }