Add PrefStore::GetValues

components/prefs/default_pref_store.h

 // Copyright (c) 2012 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_DEFAULT_PREF_STORE_H_
 #define COMPONENTS_PREFS_DEFAULT_PREF_STORE_H_
 
+#include <memory>
 #include <string>
 
 #include "base/macros.h"
 #include "base/observer_list.h"
 #include "base/values.h"
 #include "components/prefs/base_prefs_export.h"
 #include "components/prefs/pref_store.h"
 #include "components/prefs/pref_value_map.h"
 
 // Used within a PrefRegistry to keep track of default preference values.
 class COMPONENTS_PREFS_EXPORT DefaultPrefStore : public PrefStore {
  public:
   typedef PrefValueMap::const_iterator const_iterator;
 
   DefaultPrefStore();
 
   // PrefStore implementation:
   bool GetValue(const std::string& key,
                 const base::Value** result) const override;
+  std::unique_ptr<base::DictionaryValue> GetValues() const override;
   void AddObserver(PrefStore::Observer* observer) override;
   void RemoveObserver(PrefStore::Observer* observer) override;
   bool HasObservers() const override;
 
   // Sets a |value| for |key|. Should only be called if a value has not been
   // set yet; otherwise call ReplaceDefaultValue().
   void SetDefaultValue(const std::string& key,
                        std::unique_ptr<base::Value> value);
 
   // Replaces the the value for |key| with a new value. Should only be called
   // if a value has alreday been set; otherwise call SetDefaultValue().
   void ReplaceDefaultValue(const std::string& key,
                            std::unique_ptr<base::Value> value);
 
   const_iterator begin() const;
   const_iterator end() const;
 
  private:
   ~DefaultPrefStore() override;
 
   PrefValueMap prefs_;
 
   base::ObserverList<PrefStore::Observer, true> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(DefaultPrefStore);
 };
 
 #endif  // COMPONENTS_PREFS_DEFAULT_PREF_STORE_H_