Forward Kythe requests to plugins and merge in the results

pkg/analysis_server/test/integration/support/integration_test_methods.dart

 // Copyright (c) 2017, 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 2022 matching lines @@
     var params = new AnalyticsSendTimingParams(event, millis).toJson();
     var result = await server.send("analytics.sendTiming", params);
     outOfTestExpect(result, isNull);
     return null;
   }
 
   /**
    * Return the list of KytheEntry objects for some file, given the current
    * state of the file system populated by "analysis.updateContent".
    *
+   * If a request is made for a file that does not exist, or that 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
+   * GET_KYTHE_ENTRIES_INVALID_FILE will be generated.
+   *
    * Parameters
    *
    * file: FilePath
    *
    *   The file containing the code for which the Kythe Entry objects are being
    *   requested.
    *
    * Returns
    *
    * entries: List<KytheEntry>
@@ skipping 170 matching lines @@
         outOfTestExpect(params, isExecutionLaunchDataParams);
         _onExecutionLaunchData.add(
             new ExecutionLaunchDataParams.fromJson(decoder, 'params', params));
         break;
       default:
         fail('Unexpected notification: $event');
         break;
     }
   }
 }