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 525 matching lines @@
    */
   Response.unanalyzedPriorityFiles(String requestId, String fileNames)
       : this(requestId,
             error: new RequestError(RequestErrorCode.UNANALYZED_PRIORITY_FILES,
                 "Unanalyzed files cannot be a priority: '$fileNames'"));
 
   /**
    * Initialize a newly created instance to represent an error condition caused
    * by a [request] that cannot be handled by any known handlers.
    */
+  Response.errorHandlingRequest(Request request, dynamic error)
+      : this(request.id,
+            error: new RequestError(
+                RequestErrorCode.ERROR_HANDLING_REQUEST, '$error'));
+
+  /**
+   * Initialize a newly created instance to represent an error condition caused
+   * by a [request] that cannot be handled by any known handlers.
+   */
   Response.unknownRequest(Request request)
       : this(request.id,
             error: new RequestError(
                 RequestErrorCode.UNKNOWN_REQUEST, 'Unknown request'));
 
   /**
    * Initialize a newly created instance to represent an error condition caused
    * by a [request] referencing a source that does not exist.
    */
   Response.unknownSource(Request request)
@@ skipping 25 matching lines @@
     jsonObject[ID] = id;
     if (error != null) {
       jsonObject[ERROR] = error.toJson();
     }
     if (_result != null) {
       jsonObject[RESULT] = _result;
     }
     return jsonObject;
   }
 }