Log widgets source.

Test: manual
(1) Upgrading to new DB version is successful (no errors thrown in logcat)
(2) Widgets that were added with the old DB version have CONTAINER_UNKNOWN as their source container
(3) Widgets that are added with the new DB version still log source container after reboot
Bug: 185778648
Change-Id: Iaa38f0be6bc4cb0d29842f9a2ea0d08de000c930
diff --git a/protos/launcher_atom.proto b/protos/launcher_atom.proto
index 475b5be..6d49d75 100644
--- a/protos/launcher_atom.proto
+++ b/protos/launcher_atom.proto
@@ -141,6 +141,9 @@
   ALL_APPS_SEARCH_RESULT_NAVVYSITE = 25;
   ALL_APPS_SEARCH_RESULT_TIPS = 26;
   ALL_APPS_SEARCH_RESULT_PEOPLE_TILE = 27;
+
+  WIDGETS_BOTTOM_TRAY = 28;
+  WIDGETS_TRAY_PREDICTION = 29;
 }
 
 // Main app icons