Add support to pass the location of the analysis options file to plugins

pkg/analyzer_plugin/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 13 matching lines @@
  */
 abstract class IntegrationTestMixin {
   Server get server;
 
   /**
    * Used to request that the plugin perform a version check to confirm that it
    * works with the version of the analysis server that is executing it.
    *
    * Parameters
    *
-   * byteStorePath: String
+   * byteStorePath: FilePath
    *
    *   The path to the directory containing the on-disk byte store that is to
    *   be used by any analysis drivers that are created.
    *
-   * sdkPath: String
+   * sdkPath: FilePath
    *
    *   The path to the directory containing the SDK that is to be used by any
    *   analysis drivers that are created.
    *
    * version: String
    *
    *   The version number of the plugin spec supported by the analysis server
    *   that is executing the plugin.
    *
    * Returns
@@ skipping 764 matching lines @@
         outOfTestExpect(params, isAnalysisOutlineParams);
         _onAnalysisOutline
             .add(new AnalysisOutlineParams.fromJson(decoder, 'params', params));
         break;
       default:
         fail('Unexpected notification: $event');
         break;
     }
   }
 }