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

ios/chrome/browser/component_updater/ios_component_updater_configurator.cc

Index: ios/chrome/browser/component_updater/ios_component_updater_configurator.cc
diff --git a/ios/chrome/browser/component_updater/ios_component_updater_configurator.cc b/ios/chrome/browser/component_updater/ios_component_updater_configurator.cc
index c92046e5032dbcf99097557a96ab0dd67fe8208a..cf76a7041e78e6ceceb1cdb11a29f05f651238c8 100644
--- a/ios/chrome/browser/component_updater/ios_component_updater_configurator.cc
+++ b/ios/chrome/browser/component_updater/ios_component_updater_configurator.cc
@@ -7,11 +7,13 @@
 #include <string>
 #include <vector>
 
+#include "base/path_service.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "base/version.h"
 #include "components/component_updater/configurator_impl.h"
 #include "components/update_client/component_patcher_operation.h"
 #include "ios/chrome/browser/application_context.h"
+#include "ios/chrome/browser/chrome_paths.h"
 #include "ios/chrome/browser/google/google_brand.h"
 #include "ios/chrome/common/channel_info.h"
 #include "ios/web/public/web_thread.h"
@@ -48,6 +50,7 @@ class IOSConfigurator : public update_client::Configurator {
   bool UseCupSigning() const override;
   scoped_refptr<base::SequencedTaskRunner> GetSequencedTaskRunner()
       const override;
+  PrefService* GetPrefService() const override;
 
  private:
   friend class base::RefCountedThreadSafe<IOSConfigurator>;
@@ -152,6 +155,10 @@ IOSConfigurator::GetSequencedTaskRunner() const {
           base::SequencedWorkerPool::SKIP_ON_SHUTDOWN);
 }
 
+PrefService* IOSConfigurator::GetPrefService() const {
+  return NULL;
+}
+
 }  // namespace
 
 scoped_refptr<update_client::Configurator> MakeIOSComponentUpdaterConfigurator(