[Downloads/History] Add tab-url and tab-referrer-url to DownloadRow

components/history/core/browser/download_database.h

Index: components/history/core/browser/download_database.h
diff --git a/components/history/core/browser/download_database.h b/components/history/core/browser/download_database.h
index 799101614855a7ae7e61944d0a40fdf99b6ec7bf..04cdfed54b9a0daf5a560a4bcc9b2339cf059854 100644
--- a/components/history/core/browser/download_database.h
+++ b/components/history/core/browser/download_database.h
@@ -83,6 +83,10 @@ class DownloadDatabase {
   // download table.
   bool MigrateHashHttpMethodAndGenerateGuids();
 
+  // Returns true if able to add tab_url and tab_referrer_url columns to the
+  // download table.
+  bool MigrateDownloadTabUrl();
+
   // Creates the downloads table if needed.
   bool InitDownloadTable();