Add PrefStore::GetValues

components/prefs/pref_value_map.h

 // Copyright (c) 2011 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_PREFS_PREF_VALUE_MAP_H_
 #define COMPONENTS_PREFS_PREF_VALUE_MAP_H_
 
 #include <memory>
 #include <string>
 #include <unordered_map>
 #include <vector>
 
 #include "base/macros.h"
 #include "components/prefs/base_prefs_export.h"
 
 namespace base {
+class DictionaryValue;
 class Value;
 }
 
 // A generic string to value map used by the PrefStore implementations.
 class COMPONENTS_PREFS_EXPORT PrefValueMap {
  public:
   using Map = std::unordered_map<std::string, std::unique_ptr<base::Value>>;
   using iterator = Map::iterator;
   using const_iterator = Map::const_iterator;
 
@@ skipping 49 matching lines @@
 
   // Sets the value for |key| to the double |value|.
   void SetDouble(const std::string& key, const double value);
 
   // Compares this value map against |other| and stores all key names that have
   // different values in |differing_keys|. This includes keys that are present
   // only in one of the maps.
   void GetDifferingKeys(const PrefValueMap* other,
                         std::vector<std::string>* differing_keys) const;
 
+  // Copies the map into a dictionary value.
+  std::unique_ptr<base::DictionaryValue> AsDictionaryValue() const;
+
  private:
   Map prefs_;
 
   DISALLOW_COPY_AND_ASSIGN(PrefValueMap);
 };
 
 #endif  // COMPONENTS_PREFS_PREF_VALUE_MAP_H_