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

ios/chrome/browser/component_updater/ios_component_updater_configurator.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ios/chrome/browser/component_updater/ios_component_updater_configurator.h"
 
 #include <string>
 #include <vector>
 
 #include "base/threading/sequenced_worker_pool.h"
@@ skipping 30 matching lines @@
   std::string ExtraRequestParams() const override;
   std::string GetDownloadPreference() const override;
   net::URLRequestContextGetter* RequestContext() const override;
   scoped_refptr<update_client::OutOfProcessPatcher> CreateOutOfProcessPatcher()
       const override;
   bool DeltasEnabled() const override;
   bool UseBackgroundDownloader() const override;
   bool UseCupSigning() const override;
   scoped_refptr<base::SequencedTaskRunner> GetSequencedTaskRunner()
       const override;
+  PrefService* GetPrefService() const override;
 
  private:
   friend class base::RefCountedThreadSafe<IOSConfigurator>;
 
   ConfiguratorImpl configurator_impl_;
 
   ~IOSConfigurator() override {}
 };
 
 // Allows the component updater to use non-encrypted communication with the
@@ skipping 84 matching lines @@
 }
 
 scoped_refptr<base::SequencedTaskRunner>
 IOSConfigurator::GetSequencedTaskRunner() const {
   return web::WebThread::GetBlockingPool()
       ->GetSequencedTaskRunnerWithShutdownBehavior(
           web::WebThread::GetBlockingPool()->GetSequenceToken(),
           base::SequencedWorkerPool::SKIP_ON_SHUTDOWN);
 }
 
+PrefService* IOSConfigurator::GetPrefService() const {
+  return nullptr;
+}
+
 }  // namespace
 
 scoped_refptr<update_client::Configurator> MakeIOSComponentUpdaterConfigurator(
     const base::CommandLine* cmdline,
     net::URLRequestContextGetter* context_getter) {
   return new IOSConfigurator(cmdline, context_getter);
 }
 
 }  // namespace component_updater