Replicate to all renderers the accepted languages set by a layout test.

components/test_runner/tracked_dictionary.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_TEST_RUNNER_TRACKED_DICTIONARY_H_
 #define COMPONENTS_TEST_RUNNER_TRACKED_DICTIONARY_H_
 
 #include <string>
 
 #include "base/macros.h"
@@ skipping 26 matching lines @@
 
   // Overwrites |current_values| with values present in |new_changes|.
   // The new values are not present in |changed_values| afterwards.
   void ApplyUntrackedChanges(const base::DictionaryValue& new_changes);
 
   // Sets a value in |current_values| and tracks the change in |changed_values|.
   void Set(const std::string& path, scoped_ptr<base::Value> new_value);
 
   // Type-specific setter for convenience.
   void SetBoolean(const std::string& path, bool new_value);
+  void SetString(const std::string& path, const std::string& new_value);
 
  private:
   base::DictionaryValue current_values_;
   base::DictionaryValue changed_values_;
 
   DISALLOW_COPY_AND_ASSIGN(TrackedDictionary);
 };
 
 }  // namespace test_runner
 
 #endif  // COMPONENTS_TEST_RUNNER_TRACKED_DICTIONARY_H_