Persist sessionStorage on disk.

webkit/dom_storage/session_storage_database.cc

Index: webkit/dom_storage/session_storage_database.cc
diff --git a/webkit/dom_storage/session_storage_database.cc b/webkit/dom_storage/session_storage_database.cc
index 0f01db70778f2f2ba0fc43785121b34d76397d9a..eff2189fb4b5b6873e3888408c36961a4a24a505 100644
--- a/webkit/dom_storage/session_storage_database.cc
+++ b/webkit/dom_storage/session_storage_database.cc
@@ -223,6 +223,17 @@ bool SessionStorageDatabase::ReadNamespaceIds(
   return true;
 }
 
+bool SessionStorageDatabase::ReadOriginsInNamespace(
+    const std::string& namespace_id, std::vector<GURL>* origins) {
+  std::map<std::string, std::string> areas;
+  if (!GetAreasInNamespace(namespace_id, &areas))
+    return false;
+  for (std::map<std::string, std::string>::const_iterator it = areas.begin();
+       it != areas.end(); ++it)
+    origins->push_back(GURL(it->first));
+  return true;
+}
+
 bool SessionStorageDatabase::LazyOpen(bool create_if_needed) {
   base::AutoLock auto_lock(db_lock_);
   if (db_error_ || is_inconsistent_) {