Add PrefStore::GetValues

components/prefs/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_PREF_STORE_H_
 #define COMPONENTS_PREFS_PREF_STORE_H_
 
+#include <memory>
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "components/prefs/base_prefs_export.h"
 
 namespace base {
+class DictionaryValue;
 class Value;
 }
 
 // This is an abstract interface for reading and writing from/to a persistent
 // preference store, used by PrefService. An implementation using a JSON file
 // can be found in JsonPrefStore, while an implementation without any backing
 // store for testing can be found in TestingPrefStore. Furthermore, there is
 // CommandLinePrefStore, which bridges command line options to preferences and
 // ConfigurationPolicyPrefStore, which is used for hooking up configuration
 // policy with the preference subsystem.
@@ skipping 20 matching lines @@
 
   // Whether the store has completed all asynchronous initialization.
   virtual bool IsInitializationComplete() const;
 
   // Get the value for a given preference |key| and stores it in |*result|.
   // |*result| is only modified if the return value is true and if |result|
   // is not NULL. Ownership of the |*result| value remains with the PrefStore.
   virtual bool GetValue(const std::string& key,
                         const base::Value** result) const = 0;
 
+  // Get all the values.

[Sam McNally, 2017/02/20 00:31:11]

Document whether this can return null.

[tibell, 2017/02/20 03:05:09]

Done.

+  virtual std::unique_ptr<base::DictionaryValue> GetValues() const = 0;
+
  protected:
   friend class base::RefCounted<PrefStore>;
   virtual ~PrefStore() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(PrefStore);
 };
 
 #endif  // COMPONENTS_PREFS_PREF_STORE_H_