Fix error handling for formatting and update the spec

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 1055 matching lines @@
    * text is passed in so that the selection can be preserved across the
    * formatting operation. The updated selection will be as close to matching
    * the original as possible, but whitespace at the beginning or end of the
    * selected region will be ignored. If preserving selection information is
    * not required, zero (0) can be specified for both the selection offset and
    * selection length.
    *
    * If a request is made for a file which does not exist, or which is not
    * currently subject to analysis (e.g. because it is not associated with any
    * analysis root specified to analysis.setAnalysisRoots), an error of type
-   * FORMAT_INVALID_FILE will be generated.
+   * FORMAT_INVALID_FILE will be generated. If the source contains syntax
+   * errors, an error of type FORMAT_WITH_ERRORS will be generated.
    *
    * Parameters
    *
    * file ( FilePath )
    *
    *   The file containing the code to be formatted.
    *
    * selectionOffset ( int )
    *
    *   The offset of the current selection in the file.
@@ skipping 507 matching lines @@
       case "execution.launchData":
         expect(params, isExecutionLaunchDataParams);
         _onExecutionLaunchData.add(new ExecutionLaunchDataParams.fromJson(decoder, 'params', params));
         break;
       default:
         fail('Unexpected notification: $event');
         break;
     }
   }
 }