update error handling to send response with stack trace

pkg/analysis_server/test/integration/protocol_matchers.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".
 
 /**
  * Matchers for data types defined in the analysis server API
@@ skipping 1603 matching lines @@
   "RemoveContentOverlay", {
     "type": equals("remove")
   }));
 
 /**
  * RequestError
  *
  * {
  *   "code": RequestErrorCode
  *   "message": String
- *   "data": optional object
+ *   "stackTrace": optional String
  * }
  */
 final Matcher isRequestError = new LazyMatcher(() => new MatchesJsonObject(
   "RequestError", {
     "code": isRequestErrorCode,
     "message": isString
   }, optionalFields: {
-    "data": isObject
+    "stackTrace": isString
   }));
 
 /**
  * RequestErrorCode
  *
  * enum {
  *   GET_ERRORS_INVALID_FILE
  *   INVALID_OVERLAY_CHANGE
  *   INVALID_PARAMETER
  *   INVALID_REQUEST
@@ skipping 321 matching lines @@
  *
  * {
  *   "newName": String
  * }
  */
 final Matcher isRenameOptions = new LazyMatcher(() => new MatchesJsonObject(
   "rename options", {
     "newName": isString
   }));