Purge in-memory localStorage areas if the # of areas exceeds the limit

webkit/dom_storage/dom_storage_context.h

 // Copyright (c) 2012 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 WEBKIT_DOM_STORAGE_DOM_STORAGE_CONTEXT_H_
 #define WEBKIT_DOM_STORAGE_DOM_STORAGE_CONTEXT_H_
 
 #include <map>
 #include <set>
 #include <vector>
@@ skipping 149 matching lines @@
 
   // Starts backing sessionStorage on disk. This function must be called right
   // after DomStorageContext is created, before it's used.
   void SetSaveSessionStorageOnDisk();
 
   // Deletes all namespaces which don't have an associated DomStorageNamespace
   // alive. This function is used for deleting possible leftover data after an
   // unclean exit.
   void StartScavengingUnusedSessionStorage();
 
+  int64 GetInMemoryStorageSize() const;
+
  private:
   friend class DomStorageContextTest;
   FRIEND_TEST_ALL_PREFIXES(DomStorageContextTest, Basics);
   friend class base::RefCountedThreadSafe<DomStorageContext>;
   typedef std::map<int64, scoped_refptr<DomStorageNamespace> >
       StorageNamespaceMap;
 
   ~DomStorageContext();
 
   void ClearSessionOnlyOrigins();
@@ skipping 41 matching lines @@
   std::set<std::string> protected_persistent_session_ids_;
 
   // Mapping between persistent namespace IDs and namespace IDs for
   // sessionStorage.
   std::map<std::string, int64> persistent_namespace_id_to_namespace_id_;
 };
 
 }  // namespace dom_storage
 
 #endif  // WEBKIT_DOM_STORAGE_DOM_STORAGE_CONTEXT_H_