Fix error handling for formatting and update the spec

pkg/analysis_server/lib/src/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.
 
 library protocol;
 
 import 'dart:collection';
 import 'dart:convert';
 
 part 'generated_protocol.dart';
@@ skipping 672 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;
 
   /**
-   * Initialize a newly created instance to represent the
-   * FORMAT_INVALID_FILE error condition.
+   * Initialize a newly created instance to represent the FORMAT_INVALID_FILE
+   * error condition.
    */
   Response.formatInvalidFile(Request request) : this(request.id,
           error: new RequestError(RequestErrorCode.FORMAT_INVALID_FILE,
               'Error during `edit.format`: invalid file.'));
 
   /**
+   * Initialize a newly created instance to represent the FORMAT_WITH_ERROR
+   * error condition.
+   */
+  Response.formatWithErrors(Request request) : this(request.id,
+          error: new RequestError(RequestErrorCode.FORMAT_WITH_ERRORS,
+              'Error during `edit.format`: source contains syntax errors.'));
+
+  /**
    * Initialize a newly created instance based upon the given JSON data
    */
   factory Response.fromJson(Map<String, Object> json) {
     try {
       Object id = json[Response.ID];
       if (id is! String) {
         return null;
       }
       Object error = json[Response.ERROR];
       RequestError decodedError;
@@ skipping 192 matching lines @@
     hash = 0x1fffffff & (hash + ((0x03ffffff & hash) << 3));
     hash = hash ^ (hash >> 11);
     return 0x1fffffff & (hash + ((0x00003fff & hash) << 15));
   }
 
   static int hash2(a, b) => finish(combine(combine(0, a), b));
 
   static int hash4(a, b, c, d) =>
       finish(combine(combine(combine(combine(0, a), b), c), d));
 }