After 24 hours, bust the browser cache when checking for ServiceWorker updates

content/browser/service_worker/service_worker_registration.h

 // Copyright 2013 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.
 
 #ifndef CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_REGISTRATION_H_
 #define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_REGISTRATION_H_
 
 #include "base/basictypes.h"
 #include "base/gtest_prod_util.h"
 #include "base/logging.h"
@@ skipping 70 matching lines @@
   void UnsetVersion(ServiceWorkerVersion* version);
 
   // Triggers the [[Activate]] algorithm when the currently active version
   // has no controllees. If there are no controllees at the time the method
   // is called, activation is initiated immediately.
   void ActivateWaitingVersionWhenReady();
 
   bool is_deleted() const { return is_deleted_; }
   void set_is_deleted() { is_deleted_ = true; }
 
+  // The time of the most recent update check.
+  base::Time last_update_check() const { return last_update_check_; }
+  void set_last_update_check(base::Time last) { last_update_check_ = last; }
+
  private:
   friend class base::RefCounted<ServiceWorkerRegistration>;
 
   virtual ~ServiceWorkerRegistration();
 
   void SetVersionInternal(
       ServiceWorkerVersion* version,
       scoped_refptr<ServiceWorkerVersion>* data_member,
       int change_flag);
   void UnsetVersionInternal(
       ServiceWorkerVersion* version,
       ChangedVersionAttributesMask* mask);
 
   // ServiceWorkerVersion::Listener override.
   virtual void OnNoControllees(ServiceWorkerVersion* version) OVERRIDE;
 
   // This method corresponds to the [[Activate]] algorithm.
   void ActivateWaitingVersion();
   void OnActivateEventFinished(
       ServiceWorkerVersion* activating_version,
       ServiceWorkerStatusCode status);
   void ResetShouldActivateWhenReady();
   void OnDeleteFinished(ServiceWorkerStatusCode status);
 
   const GURL pattern_;
   const GURL script_url_;
   const int64 registration_id_;
   bool is_deleted_;
   bool should_activate_when_ready_;
+  base::Time last_update_check_;
   scoped_refptr<ServiceWorkerVersion> active_version_;
   scoped_refptr<ServiceWorkerVersion> waiting_version_;
   scoped_refptr<ServiceWorkerVersion> installing_version_;
   ObserverList<Listener> listeners_;
   base::WeakPtr<ServiceWorkerContextCore> context_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerRegistration);
 };
 }  // namespace content
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_REGISTRATION_H_