Move extensions storage API implementation to src/extensions

chrome/browser/extensions/api/storage/settings_frontend.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 CHROME_BROWSER_EXTENSIONS_API_STORAGE_SETTINGS_FRONTEND_H_
-#define CHROME_BROWSER_EXTENSIONS_API_STORAGE_SETTINGS_FRONTEND_H_
-
-#include <map>
-#include <string>
-
-#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/value_store_cache.h"
-#include "extensions/browser/api/storage/settings_namespace.h"
-#include "extensions/browser/browser_context_keyed_api_factory.h"
-
-namespace content {
-class BrowserContext;
-}
-
-namespace extensions {
-
-// The component of extension settings which runs on the UI thread, as opposed
-// to SettingsBackend which lives on the FILE thread.
-class SettingsFrontend : public BrowserContextKeyedAPI {
- public:
-  // Returns the current instance for |context|.
-  static SettingsFrontend* Get(content::BrowserContext* context);
-
-  // Creates with a specific |storage_factory|. Caller owns the object.
-  static SettingsFrontend* CreateForTesting(
-      const scoped_refptr<SettingsStorageFactory>& storage_factory,
-      content::BrowserContext* context);
-
-  // Public so tests can create and delete their own instances.
-  virtual ~SettingsFrontend();
-
-  // Returns the value store cache for |settings_namespace|.
-  ValueStoreCache* GetValueStoreCache(
-      settings_namespace::Namespace settings_namespace) const;
-
-  // Returns true if |settings_namespace| is a valid namespace.
-  bool IsStorageEnabled(settings_namespace::Namespace settings_namespace) const;
-
-  // Runs |callback| with the storage area of the given |settings_namespace|
-  // for the |extension|.
-  void RunWithStorage(scoped_refptr<const Extension> extension,
-                      settings_namespace::Namespace settings_namespace,
-                      const ValueStoreCache::StorageCallback& callback);
-
-  // Deletes the settings for the given |extension_id|.
-  void DeleteStorageSoon(const std::string& extension_id);
-
-  // Gets the thread-safe observer list.
-  scoped_refptr<SettingsObserverList> GetObservers();
-
-  void DisableStorageForTesting(
-      settings_namespace::Namespace settings_namespace);
-
-  // BrowserContextKeyedAPI implementation.
-  static BrowserContextKeyedAPIFactory<SettingsFrontend>* GetFactoryInstance();
-  static const char* service_name();
-  static const bool kServiceRedirectedInIncognito = true;
-  static const bool kServiceIsNULLWhileTesting = true;
-
- private:
-  friend class BrowserContextKeyedAPIFactory<SettingsFrontend>;
-
-  typedef std::map<settings_namespace::Namespace, ValueStoreCache*> CacheMap;
-
-  // Constructor for normal BrowserContextKeyedAPI usage.
-  explicit SettingsFrontend(content::BrowserContext* context);
-
-  // Constructor for tests.
-  SettingsFrontend(const scoped_refptr<SettingsStorageFactory>& storage_factory,
-                   content::BrowserContext* context);
-
-  void Init(const scoped_refptr<SettingsStorageFactory>& storage_factory);
-
-  // The (non-incognito) browser context this Frontend belongs to.
-  content::BrowserContext* const browser_context_;
-
-  // List of observers to settings changes.
-  scoped_refptr<SettingsObserverList> observers_;
-
-  // Observer for |browser_context_|.
-  scoped_ptr<SettingsObserver> browser_context_observer_;
-
-  // Maps a known namespace to its corresponding ValueStoreCache. The caches
-  // are owned by this object.
-  CacheMap caches_;
-
-  DISALLOW_COPY_AND_ASSIGN(SettingsFrontend);
-};
-
-}  // namespace extensions
-
-#endif  // CHROME_BROWSER_EXTENSIONS_API_STORAGE_SETTINGS_FRONTEND_H_