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

components/safe_browsing_db/v4_protocol_manager_util.cc

Index: components/safe_browsing_db/v4_protocol_manager_util.cc
diff --git a/components/safe_browsing_db/v4_protocol_manager_util.cc b/components/safe_browsing_db/v4_protocol_manager_util.cc
index 3dfbaefbbb00ad9d7aff75c82a20c0d65ddd2671..4bb856e4b7c6b204b8752dbace35e477d623867a 100644
--- a/components/safe_browsing_db/v4_protocol_manager_util.cc
+++ b/components/safe_browsing_db/v4_protocol_manager_util.cc
@@ -5,6 +5,7 @@
 #include "components/safe_browsing_db/v4_protocol_manager_util.h"
 
 #include "base/base64.h"
+#include "base/files/file_util.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/rand_util.h"
 #include "base/strings/string_util.h"
@@ -509,4 +510,13 @@ void V4ProtocolManagerUtil::SetClientInfoFromConfig(
   client_info->set_client_version(config.version);
 }
 
+// static
+int64_t V4ProtocolManagerUtil::GetFileSizeOrZero(
+    const base::FilePath& file_path) {
+  int64_t size;
+  if (!base::GetFileSize(file_path, &size))
+    return 0;
+  return size;
+}
+
 }  // namespace safe_browsing