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..f1e4f61851efbe0d958d78b5130b99e0e2fc9b16 100644
--- a/ios/chrome/browser/component_updater/ios_component_updater_configurator.cc
+++ b/ios/chrome/browser/component_updater/ios_component_updater_configurator.cc
@@ -48,6 +48,7 @@ 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 +153,10 @@ IOSConfigurator::GetSequencedTaskRunner() const {
           base::SequencedWorkerPool::SKIP_ON_SHUTDOWN);
 }
 
+PrefService* IOSConfigurator::GetPrefService() const {
+  return nullptr;
+}
+
 }  // namespace
 
 scoped_refptr<update_client::Configurator> MakeIOSComponentUpdaterConfigurator(