[fsp] Separate logic for saving/restoring state to a separate class.

chrome/browser/chromeos/file_system_provider/registry.h

+// Copyright 2014 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 CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_REGISTRY_H_
+#define CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_REGISTRY_H_
+
+#include <string>
+
+#include "base/memory/scoped_ptr.h"
+#include "chrome/browser/chromeos/file_system_provider/observed_entry.h"
+#include "chrome/browser/chromeos/file_system_provider/registry_interface.h"
+
+class Profile;
+
+namespace user_prefs {
+class PrefRegistrySyncable;
+}  // namespace user_prefs
+
+namespace chromeos {
+namespace file_system_provider {
+
+// Key names for preferences.
+extern const char kPrefKeyFileSystemId[];
+extern const char kPrefKeyDisplayName[];
+extern const char kPrefKeyWritable[];
+extern const char kPrefKeySupportsNotifyTag[];
+extern const char kPrefKeyObservedEntries[];
+extern const char kPrefKeyObservedEntryEntryPath[];
+extern const char kPrefKeyObservedEntryRecursive[];
+extern const char kPrefKeyObservedEntryLastTag[];
+
+class ProvidedFileSystemInfo;
+
+// Registers preferences to remember registered file systems between reboots.
+void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
+
+// Remembers and restores file systems in a persistent storage.
+class Registry : public RegistryInterface {
+ public:
+  explicit Registry(Profile* profile);
+  virtual ~Registry();
+
+  // RegistryInterface overrides.
+  virtual void RememberFileSystem(
+      const ProvidedFileSystemInfo& file_system_info,
+      const ObservedEntries& observed_entries) override;
+  virtual void ForgetFileSystem(const std::string& extension_id,
+                                const std::string& file_system_id) override;
+  virtual scoped_ptr<RestoredFileSystems> RestoreFileSystems(
+      const std::string& extension_id) override;
+  virtual void UpdateObservedEntryTag(
+      const ProvidedFileSystemInfo& file_system_info,
+      const ObservedEntry& observed_entry) override;
+
+ private:
+  Profile* profile_;  // Not owned.
+  DISALLOW_COPY_AND_ASSIGN(Registry);
+};
+
+}  // namespace file_system_provider
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_REGISTRY_H_