Add package root setting to analysis server API.

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 141 matching lines @@
  * analysis.reanalyze result
  */
 final Matcher isAnalysisReanalyzeResult = isNull;
 
 /**
  * analysis.setAnalysisRoots params
  *
  * {
  *   "included": List<FilePath>
  *   "excluded": List<FilePath>
+ *   "packageRoots": optional Map<FilePath, FilePath>
  * }
  */
 final Matcher isAnalysisSetAnalysisRootsParams = new LazyMatcher(() => new MatchesJsonObject(
   "analysis.setAnalysisRoots params", {
     "included": isListOf(isFilePath),
     "excluded": isListOf(isFilePath)
+  }, optionalFields: {
+    "packageRoots": isMapOf(isFilePath, isFilePath)
   }));
 
 /**
  * analysis.setAnalysisRoots result
  */
 final Matcher isAnalysisSetAnalysisRootsResult = isNull;
 
 /**
  * analysis.setPriorityFiles params
  *
@@ skipping 1856 matching lines @@
  *
  * {
  *   "newName": String
  * }
  */
 final Matcher isRenameOptions = new LazyMatcher(() => new MatchesJsonObject(
   "rename options", {
     "newName": isString
   }));