Fetch incremental updates. Store new state in V4Store.

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 e1ccb77edfd143b15ae3994f8404998d573db151..7797f6990d835812b9ceccc6db1177e4102c29a6 100644
--- a/components/safe_browsing_db/v4_local_database_manager.h
+++ b/components/safe_browsing_db/v4_local_database_manager.h
@@ -72,7 +72,11 @@ class V4LocalDatabaseManager : public SafeBrowsingDatabaseManager {
 
   void DatabaseReady(std::unique_ptr<V4Database> v4_database);
 
-  void OnCloseDatabase();
+  void PopulateStoreFileNameMap(StoreFileNameMap* store_file_name_map);
+
+  // At the end of ApplyUpdate method, the V4Database class calls back
+  // DatabaseUpdated which schedules the next update request.

[Scott Hess - ex-Googler, 2016/06/17 22:53:43]

This feels really specific to the implementation of V4Database.  Suggest
rewriting this to describe what the function does, without concrete info about
some other class.  Something like "Called after database update to schedule next
update request", maybe.

[vakh (use Gerrit instead), 2016/06/20 22:28:43]

Done.

+  void DatabaseUpdated();
 
   // The base directory under which to create the files that contain hashes.
   const base::FilePath base_path_;