Persist sessionStorage on disk.

webkit/dom_storage/dom_storage_context.h

Index: webkit/dom_storage/dom_storage_context.h
diff --git a/webkit/dom_storage/dom_storage_context.h b/webkit/dom_storage/dom_storage_context.h
index 3bcc6ca4a091e442be88d1be127e6665e8489056..7a1d86ada742fd58f921b3b5204de65ef7458fdd 100644
--- a/webkit/dom_storage/dom_storage_context.h
+++ b/webkit/dom_storage/dom_storage_context.h
@@ -35,6 +35,7 @@ class DomStorageArea;
 class DomStorageNamespace;
 class DomStorageSession;
 class DomStorageTaskRunner;
+class SessionStorageDatabase;
 
 // The Context is the root of an object containment hierachy for
 // Namespaces and Areas related to the owning profile.
@@ -169,6 +170,9 @@ class DomStorageContext
 
   void ClearLocalStateInCommitSequence();
 
+  void DeleteSessionNamespaceInCommitSequence(int64 namespace_id);
+  void DeleteLeftoverDataInCommitSequence();
+
   // Collection of namespaces keyed by id.
   StorageNamespaceMap namespaces_;
 
@@ -194,6 +198,7 @@ class DomStorageContext
   bool clear_local_state_;
   bool save_session_state_;
   scoped_refptr<quota::SpecialStoragePolicy> special_storage_policy_;
+  scoped_refptr<SessionStorageDatabase> session_storage_database_;
 };
 
 }  // namespace dom_storage