Add module for counting date-last-roll-call and persisting those counts

components/update_client/update_response.h

Index: components/update_client/update_response.h
diff --git a/components/update_client/update_response.h b/components/update_client/update_response.h
index 6d93d263b4a8e212474edf2b430d4e1fe08f2aaf..6c0ea9bd9351497a793aa5bc5d1cf7cfc464189e 100644
--- a/components/update_client/update_response.h
+++ b/components/update_client/update_response.h
@@ -109,6 +109,8 @@ class UpdateResponse {
 
     // This will be >= 0, or kNoDaystart if the <daystart> tag was not present.
     int daystart_elapsed_seconds;
+    // This will be >= 0, or kNoDaystart if the <daystart> tag was not present.
+    int daystart_elapsed_days;
     std::vector<Result> list;
   };