Add PrefStore::GetValues

components/prefs/json_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_JSON_PREF_STORE_H_
 #define COMPONENTS_PREFS_JSON_PREF_STORE_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 66 matching lines @@
   // will be moved to |pref_filename| before the read occurs.
   JsonPrefStore(
       const base::FilePath& pref_filename,
       const base::FilePath& pref_alternate_filename,
       const scoped_refptr<base::SequencedTaskRunner>& sequenced_task_runner,
       std::unique_ptr<PrefFilter> pref_filter);
 
   // PrefStore overrides:
   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;
   bool IsInitializationComplete() const override;
 
   // PersistentPrefStore overrides:
   bool GetMutableValue(const std::string& key, base::Value** result) override;
   void SetValue(const std::string& key,
                 std::unique_ptr<base::Value> value,
                 uint32_t flags) override;
@@ skipping 157 matching lines @@
 
   bool has_pending_write_reply_ = true;
   base::Closure on_next_successful_write_reply_;
 
   WriteCountHistogram write_count_histogram_;
 
   DISALLOW_COPY_AND_ASSIGN(JsonPrefStore);
 };
 
 #endif  // COMPONENTS_PREFS_JSON_PREF_STORE_H_