Create a PrefStore in support of Blimp metrics collection.

android_webview/browser/aw_pref_store.h

-// Copyright (c) 2013 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 ANDROID_WEBVIEW_BROWSER_AW_PREF_STORE_H_
-#define ANDROID_WEBVIEW_BROWSER_AW_PREF_STORE_H_
-
-#include <stdint.h>
-
-#include <string>
-
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-#include "base/observer_list.h"
-#include "components/prefs/persistent_pref_store.h"
-#include "components/prefs/pref_value_map.h"
-
-// A light-weight prefstore implementation that keeps preferences
-// in a memory backed store. This is not a persistent prefstore -- we
-// subclass the PersistentPrefStore here since it is needed by the
-// PrefService, which in turn is needed by the Autofill component.
-class AwPrefStore : public PersistentPrefStore {
- public:
-  AwPrefStore();
-
-  // Overriden from PrefStore.
-  bool GetValue(const std::string& key,
-                const base::Value** result) 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 ReportValueChanged(const std::string& key, uint32_t flags) override;
-  void SetValue(const std::string& key,
-                std::unique_ptr<base::Value> value,
-                uint32_t flags) override;
-  void SetValueSilently(const std::string& key,
-                        std::unique_ptr<base::Value> value,
-                        uint32_t flags) override;
-  void RemoveValue(const std::string& key, uint32_t flags) override;
-  bool ReadOnly() const override;
-  PrefReadError GetReadError() const override;
-  PersistentPrefStore::PrefReadError ReadPrefs() override;
-  void ReadPrefsAsync(ReadErrorDelegate* error_delegate) override;
-  void CommitPendingWrite() override {}
-  void SchedulePendingLossyWrites() override {}
-  void ClearMutableValues() override {}
-
- protected:
-  ~AwPrefStore() override;
-
- private:
-  // Stores the preference values.
-  PrefValueMap prefs_;
-
-  base::ObserverList<PrefStore::Observer, true> observers_;
-
-  DISALLOW_COPY_AND_ASSIGN(AwPrefStore);
-};
-
-#endif  // ANDROID_WEBVIEW_BROWSER_AW_PREF_STORE_H_