Split TabRestoreService into InMemoryTRS and PersistentTRS

chrome/browser/sessions/in_memory_tab_restore_service.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_SESSIONS_IN_MEMORY_TAB_RESTORE_SERVICE_H_
+#define CHROME_BROWSER_SESSIONS_IN_MEMORY_TAB_RESTORE_SERVICE_H_
+
+#include "chrome/browser/sessions/tab_restore_service.h"
+#include "chrome/browser/sessions/tab_restore_service_helper.h"
+
+// Tab restore service that doesn't persist tabs on disk. This is used on
+// Android where tabs persistence is implemented on the application side in
+// Java. Other platforms should use PersistentTabRestoreService which can be
+// instantiated through the TabRestoreServiceFactory.
+class InMemoryTabRestoreService : public TabRestoreService {
+ public:
+  // Creates a new TabRestoreService and provides an object that provides the
+  // current time. The TabRestoreService does not take ownership of the
+  // |time_factory_|.
+  InMemoryTabRestoreService(Profile* profile,
+                            TimeFactory* time_factory);
+
+  virtual ~InMemoryTabRestoreService();
+
+  // TabRestoreService:
+  virtual void AddObserver(TabRestoreServiceObserver* observer) OVERRIDE;
+  virtual void RemoveObserver(TabRestoreServiceObserver* observer) OVERRIDE;
+  virtual void CreateHistoricalTab(content::WebContents* contents,
+                                   int index) OVERRIDE;
+  virtual void BrowserClosing(TabRestoreServiceDelegate* delegate) OVERRIDE;
+  virtual void BrowserClosed(TabRestoreServiceDelegate* delegate) OVERRIDE;
+  virtual void ClearEntries() OVERRIDE;
+  virtual const Entries& entries() const OVERRIDE;
+  virtual void RestoreMostRecentEntry(
+      TabRestoreServiceDelegate* delegate) OVERRIDE;
+  virtual Tab* RemoveTabEntryById(SessionID::id_type id) OVERRIDE;
+  virtual void RestoreEntryById(TabRestoreServiceDelegate* delegate,
+                                SessionID::id_type id,
+                                WindowOpenDisposition disposition) OVERRIDE;
+  virtual void LoadTabsFromLastSession() OVERRIDE;
+  virtual bool IsLoaded() const OVERRIDE;
+  virtual void DeleteLastSession() OVERRIDE;
+  virtual void Shutdown() OVERRIDE;
+
+ private:
+  TabRestoreServiceHelper helper_;
+
+  DISALLOW_COPY_AND_ASSIGN(InMemoryTabRestoreService);
+};
+
+#endif  // CHROME_BROWSER_SESSIONS_IN_MEMORY_TAB_RESTORE_SERVICE_H_