Skeleton of the overall design for the database for Pver4

components/safe_browsing_db/v4_local_database_manager.h

Index: components/safe_browsing_db/v4_local_database_manager.h
diff --git a/components/safe_browsing_db/v4_local_database_manager.h b/components/safe_browsing_db/v4_local_database_manager.h
index 9edca529042c28b3cb59e9d0daee669ae9bb1fff..ac8900c8822da87700609303c6cbb442978a57ff 100644
--- a/components/safe_browsing_db/v4_local_database_manager.h
+++ b/components/safe_browsing_db/v4_local_database_manager.h
@@ -12,6 +12,7 @@
 
 #include "components/safe_browsing_db/database_manager.h"
 #include "components/safe_browsing_db/hit_report.h"
+#include "components/safe_browsing_db/v4_database.h"
 #include "components/safe_browsing_db/v4_protocol_manager_util.h"
 #include "components/safe_browsing_db/v4_update_protocol_manager.h"
 #include "url/gurl.h"
@@ -69,11 +70,16 @@ class V4LocalDatabaseManager : public SafeBrowsingDatabaseManager {
 
   // Stores the current status of the lists to download from the SafeBrowsing
   // servers.
+  // TODO(vakh): current_list_states_ doesn't really belong here.
+  // It should come through the database, from the various V4Stores.
   base::hash_map<UpdateListIdentifier, std::string> current_list_states_;
 
   // The protocol manager that downloads the hash prefix updates.
   std::unique_ptr<V4UpdateProtocolManager> v4_update_protocol_manager_;
 
+  // The database that manages the stores containing the hash prefix updates.
+  std::unique_ptr<V4Database> v4_database_;
+
   friend class base::RefCountedThreadSafe<V4LocalDatabaseManager>;
   DISALLOW_COPY_AND_ASSIGN(V4LocalDatabaseManager);
 };  // class V4LocalDatabaseManager