Restore sessionStorage when chrome restarts.

content/browser/in_process_webkit/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_BROWSER_IN_PROCESS_WEBKIT_DOM_STORAGE_CONTEXT_H_
 #define CONTENT_BROWSER_IN_PROCESS_WEBKIT_DOM_STORAGE_CONTEXT_H_
 #pragma once
 
 #include <map>
 #include <set>
@@ skipping 49 matching lines @@
   DOMStorageArea* GetStorageArea(int64 id);
 
   // Called on WebKit thread when a session storage namespace can be deleted.
   void DeleteSessionStorageNamespace(int64 namespace_id);
 
   // Get a namespace from an id.  What's returned is owned by this class.  If
   // allocation_allowed is true, then this function will create the storage
   // namespace if it hasn't been already.
   DOMStorageNamespace* GetStorageNamespace(int64 id, bool allocation_allowed);
 
+  // Creates a session storage namespace which is backed up by the existing
+  // |session_storage_directory|.
+  DOMStorageNamespace* RecreateSessionStorageNamespace(
+      int64 id,
+      const FilePath& session_storage_directory);
+
   // Sometimes an event from one DOM storage message filter requires
   // communication to all of them.
   typedef std::set<DOMStorageMessageFilter*> MessageFilterSet;
   void RegisterMessageFilter(DOMStorageMessageFilter* message_filter);
   void UnregisterMessageFilter(DOMStorageMessageFilter* MessageFilter);
   const MessageFilterSet* GetMessageFilterSet() const;
 
   // Tells storage namespaces to purge any memory they do not need.
   virtual void PurgeMemory();
 
   // 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.
   void DeleteDataModifiedSince(const base::Time& cutoff);
 
   // Deletes a single local storage file.
   void DeleteLocalStorageFile(const FilePath& file_path);
 
   // Deletes the local storage file for the given origin.
   void DeleteLocalStorageForOrigin(const string16& origin_id);
 
   // Deletes all local storage files.
   void DeleteAllLocalStorageFiles();
 
   // The local storage directory.
   static const FilePath::CharType kLocalStorageDirectory[];
 
+  // The session storage directory.
+  static const FilePath::CharType kSessionStorageDirectory[];
+
   // The local storage file extension.
   static const FilePath::CharType kLocalStorageExtension[];
 
   // Get the file name of the local storage file for the given origin.
   FilePath GetLocalStorageFilePath(const string16& origin_id) const;
 
   void set_clear_local_state_on_exit_(bool clear_local_state) {
     clear_local_state_on_exit_ = clear_local_state;
   }
 
@@ skipping 61 matching lines @@
   // Maps ids to StorageNamespaces.  We own these objects.
   typedef std::map<int64, DOMStorageNamespace*> StorageNamespaceMap;
   StorageNamespaceMap storage_namespace_map_;
 
   scoped_refptr<quota::SpecialStoragePolicy> special_storage_policy_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(DOMStorageContext);
 };
 
 #endif  // CONTENT_BROWSER_IN_PROCESS_WEBKIT_DOM_STORAGE_CONTEXT_H_