Persist sessionStorage on disk.

chrome/browser/sessions/session_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_SESSION_SERVICE_H_
 #define CHROME_BROWSER_SESSIONS_SESSION_SERVICE_H_
 #pragma once
 
 #include <map>
 #include <string>
@@ skipping 237 matching lines @@
   SessionCommand* CreateSetSelectedNavigationIndexCommand(
       const SessionID& tab_id,
       int index);
 
   SessionCommand* CreateSetWindowTypeCommand(const SessionID& window_id,
                                              WindowType type);
 
   SessionCommand* CreatePinnedStateCommand(const SessionID& tab_id,
                                            bool is_pinned);
 
+  SessionCommand* CreateSessionStorageAssociatedCommand(
+      const SessionID& tab_id,
+      const std::string& session_storage_persistent_id);
+
   // Callback from the backend for getting the commands from the save file.
   // Converts the commands in SessionWindows and notifies the real callback.
   void OnGotSessionCommands(
       Handle handle,
       scoped_refptr<InternalGetCommandsRequest> request);
 
   // Converts the commands into SessionWindows. On return any valid
   // windows are added to valid_windows. It is up to the caller to delete
   // the windows added to valid_windows.
   //
@@ skipping 202 matching lines @@
   const base::TimeDelta save_delay_in_hrs_;
 
   // For browser_tests, since we want to simulate the browser shutting down
   // without quitting.
   bool force_browser_not_alive_with_no_windows_;
 
   DISALLOW_COPY_AND_ASSIGN(SessionService);
 };
 
 #endif  // CHROME_BROWSER_SESSIONS_SESSION_SERVICE_H_