Add a diagnostic.getServerPort analysis server request.

pkg/analysis_server/lib/plugin/protocol/protocol.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.
 
 /**
  * Support for client code that needs to interact with the requests, responses
  * and notifications that are part of the analysis server's wire protocol.
  */
 library analysis_server.plugin.protocol.protocol;
 
@@ skipping 321 matching lines @@
   /**
    * Initialize a newly created instance to represent a response to a request
    * with the given [id].  If [_result] is provided, it will be used as the
    * result; otherwise an empty result will be used.  If an [error] is provided
    * then the response will represent an error condition.
    */
   Response(this.id, {Map<String, Object> result, this.error})
       : _result = result;
 
   /**
+   * Create and return the `DEBUG_PORT_COULD_NOT_BE_OPENED` error response.
+   */
+  Response.debugPortCouldNotBeOpened(Request request, dynamic error)
+      : this(request.id,
+      error: new RequestError(
+          RequestErrorCode.DEBUG_PORT_COULD_NOT_BE_OPENED, '$error'));
+
+  /**
    * Initialize a newly created instance to represent the FILE_NOT_ANALYZED
    * error condition.
    */
   Response.fileNotAnalyzed(Request request, String file)
       : this(request.id,
             error: new RequestError(RequestErrorCode.FILE_NOT_ANALYZED,
                 'File is not analyzed: $file.'));
 
   /**
    * Initialize a newly created instance to represent the FORMAT_INVALID_FILE
@@ skipping 229 matching lines @@
     jsonObject[ID] = id;
     if (error != null) {
       jsonObject[ERROR] = error.toJson();
     }
     if (_result != null) {
       jsonObject[RESULT] = _result;
     }
     return jsonObject;
   }
 }