Persist sessionStorage on disk.

content/public/browser/dom_storage_context.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 CONTENT_PUBLIC_BROWSER_DOM_STORAGE_CONTEXT_H_
 #define CONTENT_PUBLIC_BROWSER_DOM_STORAGE_CONTEXT_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 28 matching lines @@
   virtual void DeleteForOrigin(const string16& origin_id) = 0;
 
   // Deletes a single local storage file.
   virtual void DeleteLocalStorageFile(const FilePath& file_path) = 0;
 
   // Delete any local storage files that have been touched since the cutoff
   // date that's supplied. Protected origins, per the SpecialStoragePolicy,
   // are not deleted by this method.
   virtual void DeleteDataModifiedSince(const base::Time& cutoff) = 0;
 
+  // For associating sessionStorages after a session restore.
+  virtual void AssociateSessionStorage(int64 namespace_id, int64 real_id) = 0;
+
  protected:
   virtual ~DOMStorageContext() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_DOM_STORAGE_CONTEXT_H_