[Background Sync] Converting Blink code to the MVP API

Source/modules/background_sync/ServiceWorkerRegistrationSync.cpp

 // 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 "config.h"
 #include "modules/background_sync/ServiceWorkerRegistrationSync.h"
 
+#include "modules/background_sync/PeriodicSyncManager.h"
 #include "modules/background_sync/SyncManager.h"
 #include "modules/serviceworkers/ServiceWorkerRegistration.h"
 
 namespace blink {
 
 ServiceWorkerRegistrationSync::ServiceWorkerRegistrationSync(ServiceWorkerRegistration* registration)
     : m_registration(registration)
 {
 }
 
 ServiceWorkerRegistrationSync::~ServiceWorkerRegistrationSync()
 {
 }
 
 const char* ServiceWorkerRegistrationSync::supplementName()
 {
     return "ServiceWorkerRegistrationSync";
 }
 
 ServiceWorkerRegistrationSync& ServiceWorkerRegistrationSync::from(ServiceWorkerRegistration& registration)
 {
     ServiceWorkerRegistrationSync* supplement = static_cast<ServiceWorkerRegistrationSync*>(HeapSupplement<ServiceWorkerRegistration>::from(registration, supplementName()));
     if (!supplement) {
         supplement = new ServiceWorkerRegistrationSync(&registration);
         provideTo(registration, supplementName(), supplement);
     }
     return *supplement;
 }
 
-SyncManager* ServiceWorkerRegistrationSync::syncManager(ServiceWorkerRegistration& registration)
+SyncManager* ServiceWorkerRegistrationSync::sync(ServiceWorkerRegistration& registration)
 {
-    return ServiceWorkerRegistrationSync::from(registration).syncManager();
+    return ServiceWorkerRegistrationSync::from(registration).sync();
 }
 
-SyncManager* ServiceWorkerRegistrationSync::syncManager()
+SyncManager* ServiceWorkerRegistrationSync::sync()
 {
     if (!m_syncManager)
         m_syncManager = SyncManager::create(m_registration);
     return m_syncManager.get();
 }
 
+PeriodicSyncManager* ServiceWorkerRegistrationSync::periodicSync(ServiceWorkerRegistration& registration)
+{
+    return ServiceWorkerRegistrationSync::from(registration).periodicSync();
+}
+
+PeriodicSyncManager* ServiceWorkerRegistrationSync::periodicSync()
+{
+    if (!m_periodicSyncManager)
+        m_periodicSyncManager = PeriodicSyncManager::create(m_registration);
+    return m_periodicSyncManager.get();
+}
+
 DEFINE_TRACE(ServiceWorkerRegistrationSync)
 {
     visitor->trace(m_registration);
     visitor->trace(m_syncManager);
+    visitor->trace(m_periodicSyncManager);
     HeapSupplement<ServiceWorkerRegistration>::trace(visitor);
 }
 
 } // namespace blink