Persist sessionStorage on disk.

webkit/dom_storage/dom_storage_area.h

Index: webkit/dom_storage/dom_storage_area.h
diff --git a/webkit/dom_storage/dom_storage_area.h b/webkit/dom_storage/dom_storage_area.h
index 1dbf31ca39771e298821dffd13db94db7c17d0ac..7a179010ee57be1736c57c4f2a4c785c3c4da0fa 100644
--- a/webkit/dom_storage/dom_storage_area.h
+++ b/webkit/dom_storage/dom_storage_area.h
@@ -19,6 +19,7 @@ namespace dom_storage {
 class DomStorageDatabaseAdapter;
 class DomStorageMap;
 class DomStorageTaskRunner;
+class SessionStorageDatabase;
 
 // Container for a per-origin Map of key/value pairs potentially
 // backed by storage on disk and lazily commits changes to disk.
@@ -36,10 +37,11 @@ class DomStorageArea
                  const FilePath& directory,
                  DomStorageTaskRunner* task_runner);
 
-  // Session storage.
+  // Session storage. Backed on disk if |session_storage_backing| is not NULL.
   DomStorageArea(int64 namespace_id,
                  const std::string& persistent_namespace_id,
                  const GURL& origin,
+                 SessionStorageDatabase* session_storage_backing,
                  DomStorageTaskRunner* task_runner);
 
   const GURL& origin() const { return origin_; }
@@ -119,6 +121,7 @@ class DomStorageArea
   scoped_refptr<DomStorageTaskRunner> task_runner_;
   scoped_refptr<DomStorageMap> map_;
   scoped_ptr<DomStorageDatabaseAdapter> backing_;
+  scoped_refptr<SessionStorageDatabase> session_storage_backing_;
   bool is_initial_import_done_;
   bool is_shutdown_;
   scoped_ptr<CommitBatch> commit_batch_;