Log the size of each of the stores and complete DB on launch and after each

components/safe_browsing_db/v4_database.h

 // Copyright 2016 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 COMPONENTS_SAFE_BROWSING_DB_V4_DATABASE_H_
 #define COMPONENTS_SAFE_BROWSING_DB_V4_DATABASE_H_
 
 #include "base/callback.h"
 #include "base/files/file_path.h"
 #include "base/memory/ref_counted.h"
@@ skipping 118 matching lines @@
   void ResetStores(const std::vector<ListIdentifier>& stores_to_reset);
 
   // Schedules verification of the checksum of each store read from disk on task
   // runner. If the checksum doesn't match, that store is passed to the
   // |db_ready_for_updates_callback|. At the end,
   // |db_ready_for_updates_callback| is scheduled (on the same thread as it was
   // called) to indicate that the database updates can now be scheduled.
   void VerifyChecksum(
       DatabaseReadyForUpdatesCallback db_ready_for_updates_callback);
 
+  // Records the size of each of the stores managed by this database, along
+  // with the combined size of all the stores.
+  void RecordFileSizeHistograms();
+
  protected:
   V4Database(const scoped_refptr<base::SequencedTaskRunner>& db_task_runner,
              std::unique_ptr<StoreMap> store_map);
 
  private:
   friend class V4DatabaseTest;
   FRIEND_TEST_ALL_PREFIXES(V4DatabaseTest, TestSetupDatabaseWithFakeStores);
   FRIEND_TEST_ALL_PREFIXES(V4DatabaseTest,
                            TestSetupDatabaseWithFakeStoresFailsReset);
   FRIEND_TEST_ALL_PREFIXES(V4DatabaseTest, TestApplyUpdateWithNewStates);
@@ skipping 44 matching lines @@
   // that needed updating and is ready for the next update. It should only be
   // accessed on the IO thread.
   int pending_store_updates_;
 
   DISALLOW_COPY_AND_ASSIGN(V4Database);
 };
 
 }  // namespace safe_browsing
 
 #endif  // COMPONENTS_SAFE_BROWSING_DB_V4_DATABASE_H_