Extension Settings API: make it so that when leveldb storage areas fail to be

chrome/browser/extensions/settings/settings_storage_factory.h

+// Copyright (c) 2011 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_SETTINGS_SETTINGS_STORAGE_FACTORY_H_
+#define CHROME_BROWSER_EXTENSIONS_SETTINGS_SETTINGS_STORAGE_FACTORY_H_
+#pragma once
+
+class FilePath;
+
+namespace extensions {
+
+class SettingsStorage;
+
+// Factory for creating SettingStorage instances.
+class SettingsStorageFactory {
+ public:
+  virtual ~SettingsStorageFactory() {}
+
+  // Create a new SettingsLeveldbStorage area.  Return NULL to indicate
+  // failure.  Must be called on the FILE thread.
+  virtual SettingsStorage* Create(
+      const FilePath& base_path, const std::string& extension_id) = 0;
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_SETTINGS_SETTINGS_STORAGE_FACTORY_H_