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

components/safe_browsing_db/v4_local_database_manager.cc

Index: components/safe_browsing_db/v4_local_database_manager.cc
diff --git a/components/safe_browsing_db/v4_local_database_manager.cc b/components/safe_browsing_db/v4_local_database_manager.cc
index 5798bf2af85f7031247620061388d09ce9695088..bef4313f5441acd25ce54fd984a2cdae5e3b7cbd 100644
--- a/components/safe_browsing_db/v4_local_database_manager.cc
+++ b/components/safe_browsing_db/v4_local_database_manager.cc
@@ -296,6 +296,8 @@ void V4LocalDatabaseManager::DatabaseReadyForChecks(
   if (enabled_) {
     v4_database_ = std::move(v4_database);
 
+    v4_database_->RecordFileSizeHistograms();
+
     // The consistency of the stores read from the disk needs to verified. Post
     // that task on the task runner. It calls |DatabaseReadyForUpdates|
     // callback with the stores to reset, if any, and then we can schedule the
@@ -324,6 +326,7 @@ void V4LocalDatabaseManager::DatabaseReadyForUpdates(
 
 void V4LocalDatabaseManager::DatabaseUpdated() {
   if (enabled_) {
+    v4_database_->RecordFileSizeHistograms();
     v4_update_protocol_manager_->ScheduleNextUpdate(
         v4_database_->GetStoreStateMap());
   }