add a download slices table into history download db

chrome/browser/download/download_history.cc

Index: chrome/browser/download/download_history.cc
diff --git a/chrome/browser/download/download_history.cc b/chrome/browser/download/download_history.cc
index e79dec2caeda511682db87b022712705cafe716c..f0865e2db43ad7c8315b1307266cd616d0e9cbe6 100644
--- a/chrome/browser/download/download_history.cc
+++ b/chrome/browser/download/download_history.cc
@@ -140,7 +140,9 @@ history::DownloadRow GetDownloadRow(
       history::ToHistoryDownloadInterruptReason(item->GetLastReason()),
       std::string(),  // Hash value (not available yet)
       history::ToHistoryDownloadId(item->GetId()), item->GetGuid(),
-      item->GetOpened(), by_ext_id, by_ext_name);
+      item->GetOpened(), by_ext_id, by_ext_name,
+      // TODO(qinmin): get the slice information.
+      std::vector<history::DownloadSliceInfo>());
 }
 
 enum class ShouldUpdateHistoryResult {