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diff --git a/chrome/browser/extensions/api/storage/settings_backend.h b/chrome/browser/extensions/api/storage/settings_backend.h
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+++ b/chrome/browser/extensions/api/storage/settings_backend.h
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+// 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 CHROME_BROWSER_EXTENSIONS_API_STORAGE_SETTINGS_BACKEND_H_
+#define CHROME_BROWSER_EXTENSIONS_API_STORAGE_SETTINGS_BACKEND_H_
+
+#include <map>
+#include <set>
+#include <string>
+
+#include "base/compiler_specific.h"
+#include "base/file_path.h"
+#include "base/memory/linked_ptr.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "chrome/browser/extensions/api/storage/settings_observer.h"
+#include "chrome/browser/extensions/api/storage/settings_storage_factory.h"
+#include "chrome/browser/extensions/api/storage/settings_storage_quota_enforcer.h"
+#include "sync/api/syncable_service.h"
+
+namespace syncer {
+class SyncErrorFactory;
+}
+
+namespace extensions {
+
+class SettingsSyncProcessor;
+class SyncableSettingsStorage;
+
+// Manages ValueStore objects for extensions, including routing
+// changes from sync to them.
+// Lives entirely on the FILE thread.
+class SettingsBackend : public syncer::SyncableService {
+ public:
+  // |storage_factory| is use to create leveldb storage areas.
+  // |base_path| is the base of the extension settings directory, so the
+  // databases will be at base_path/extension_id.
+  // |observers| is the list of observers to settings changes.
+  SettingsBackend(
+      const scoped_refptr<SettingsStorageFactory>& storage_factory,
+      const FilePath& base_path,
+      const SettingsStorageQuotaEnforcer::Limits& quota,
+      const scoped_refptr<SettingsObserverList>& observers);
+
+  virtual ~SettingsBackend();
+
+  // Gets a weak reference to the storage area for |extension_id|.
+  // Must be run on the FILE thread.
+  ValueStore* GetStorage(const std::string& extension_id) const;
+
+  // Deletes all setting data for an extension. Call on the FILE thread.
+  void DeleteStorage(const std::string& extension_id);
+
+  // syncer::SyncableService implementation.
+  virtual syncer::SyncDataList GetAllSyncData(
+      syncer::ModelType type) const OVERRIDE;
+  virtual syncer::SyncMergeResult MergeDataAndStartSyncing(
+      syncer::ModelType type,
+      const syncer::SyncDataList& initial_sync_data,
+      scoped_ptr<syncer::SyncChangeProcessor> sync_processor,
+      scoped_ptr<syncer::SyncErrorFactory> sync_error_factory) OVERRIDE;
+  virtual syncer::SyncError ProcessSyncChanges(
+      const tracked_objects::Location& from_here,
+      const syncer::SyncChangeList& change_list) OVERRIDE;
+  virtual void StopSyncing(syncer::ModelType type) OVERRIDE;
+
+ private:
+  // Gets a weak reference to the storage area for a given extension,
+  // initializing sync with some initial data if sync enabled.
+  SyncableSettingsStorage* GetOrCreateStorageWithSyncData(
+      const std::string& extension_id,
+      const DictionaryValue& sync_data) const;
+
+  // Gets all extension IDs known to extension settings.  This may not be all
+  // installed extensions.
+  std::set<std::string> GetKnownExtensionIDs() const;
+
+  // Creates a new SettingsSyncProcessor for an extension.
+  scoped_ptr<SettingsSyncProcessor> CreateSettingsSyncProcessor(
+      const std::string& extension_id) const;
+
+  // The Factory to use for creating leveldb storage areas.
+  const scoped_refptr<SettingsStorageFactory> storage_factory_;
+
+  // The base file path to create any leveldb databases at.
+  const FilePath base_path_;
+
+  // Quota limits (see SettingsStorageQuotaEnforcer).
+  const SettingsStorageQuotaEnforcer::Limits quota_;
+
+  // The list of observers to settings changes.
+  const scoped_refptr<SettingsObserverList> observers_;
+
+  // A cache of ValueStore objects that have already been created.
+  // Ensure that there is only ever one created per extension.
+  typedef std::map<std::string, linked_ptr<SyncableSettingsStorage> >
+      StorageObjMap;
+  mutable StorageObjMap storage_objs_;
+
+  // Current sync model type.  Will be UNSPECIFIED if sync hasn't been enabled
+  // yet, and either SETTINGS or APP_SETTINGS if it has been.
+  syncer::ModelType sync_type_;
+
+  // Current sync processor, if any.
+  scoped_ptr<syncer::SyncChangeProcessor> sync_processor_;
+
+  // Current sync error handler if any.
+  scoped_ptr<syncer::SyncErrorFactory> sync_error_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(SettingsBackend);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_API_STORAGE_SETTINGS_BACKEND_H_