Service Worker: in Unregister, wait until after the active worker no longer controls a document

content/browser/service_worker/service_worker_registration.h

Index: content/browser/service_worker/service_worker_registration.h
diff --git a/content/browser/service_worker/service_worker_registration.h b/content/browser/service_worker/service_worker_registration.h
index 41092889e74c4396711d5d829d02a63bbfbf0645..c170a97151caaca897e58a7f55340b1c66735b30 100644
--- a/content/browser/service_worker/service_worker_registration.h
+++ b/content/browser/service_worker/service_worker_registration.h
@@ -60,6 +60,8 @@ class CONTENT_EXPORT ServiceWorkerRegistration
     return installing_version_.get();
   }
 
+  bool is_uninstalling() const { return is_uninstalling_; }
+
   void AddListener(Listener* listener);
   void RemoveListener(Listener* listener);
 
@@ -85,6 +87,16 @@ class CONTENT_EXPORT ServiceWorkerRegistration
   bool is_deleted() const { return is_deleted_; }
   void set_is_deleted() { is_deleted_ = true; }
 
+  // Triggers the [[ClearRegistration]] algorithm when the currently
+  // active version has no controllees. Deletes this registration
+  // from storage immediately.
+  void ClearWhenReady();
+
+  // Restores this registration in storage and cancels the pending
+  // [[ClearRegistration]] algorithm. If the algorithm was already triggered,
+  // does nothing.
+  void AbortPendingClear();
+
  private:
   friend class base::RefCounted<ServiceWorkerRegistration>;
 
@@ -98,9 +110,16 @@ class CONTENT_EXPORT ServiceWorkerRegistration
       ServiceWorkerVersion* version,
       ChangedVersionAttributesMask* mask);
 
+  bool IsListeningForNoControllees();
+  void SetShouldActivateWhenReady(bool should_activate);
+  void SetUninstalling(bool is_uninstalling);
+
   // ServiceWorkerVersion::Listener override.
   virtual void OnNoControllees(ServiceWorkerVersion* version) OVERRIDE;
 
+  // This method corresponds to the [[ClearRegistration]] algorithm.
+  void Clear();
+
   // This method corresponds to the [[Activate]] algorithm.
   void ActivateWaitingVersion();
   void OnActivateEventFinished(
@@ -113,6 +132,7 @@ class CONTENT_EXPORT ServiceWorkerRegistration
   const GURL script_url_;
   const int64 registration_id_;
   bool is_deleted_;
+  bool is_uninstalling_;
   bool should_activate_when_ready_;
   scoped_refptr<ServiceWorkerVersion> active_version_;
   scoped_refptr<ServiceWorkerVersion> waiting_version_;
@@ -122,5 +142,7 @@ class CONTENT_EXPORT ServiceWorkerRegistration
 
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerRegistration);
 };
+
 }  // namespace content
+
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_REGISTRATION_H_