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

components/update_client/update_client.cc

Index: components/update_client/update_client.cc
diff --git a/components/update_client/update_client.cc b/components/update_client/update_client.cc
index 8fa551d734992c4d908e55561a2365e8e129685a..8e1fdf230cdc4ce5d728c963d17fa2f7ba1d2c6f 100644
--- a/components/update_client/update_client.cc
+++ b/components/update_client/update_client.cc
@@ -22,8 +22,10 @@
 #include "base/thread_task_runner_handle.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "base/threading/thread_checker.h"
+#include "components/prefs/pref_registry_simple.h"
 #include "components/update_client/configurator.h"
 #include "components/update_client/crx_update_item.h"
+#include "components/update_client/persisted_data.h"
 #include "components/update_client/ping_manager.h"
 #include "components/update_client/task_update.h"
 #include "components/update_client/update_checker.h"
@@ -253,4 +255,8 @@ scoped_refptr<UpdateClient> UpdateClientFactory(
                               &UpdateChecker::Create, &CrxDownloader::Create);
 }
 
+void RegisterPrefs(PrefRegistrySimple* registry) {
+  PersistedData::RegisterPrefs(registry);
+}
+
 }  // namespace update_client