Implement the ability to get all notifications in Chromium.

content/browser/notifications/platform_notification_context_impl.h

Index: content/browser/notifications/platform_notification_context_impl.h
diff --git a/content/browser/notifications/platform_notification_context_impl.h b/content/browser/notifications/platform_notification_context_impl.h
index 757d22e42b130377f72f5d10461b59cca4072186..e208324774b82d65da0be59cc4297ef82859a774 100644
--- a/content/browser/notifications/platform_notification_context_impl.h
+++ b/content/browser/notifications/platform_notification_context_impl.h
@@ -62,6 +62,10 @@ class CONTENT_EXPORT PlatformNotificationContextImpl
   void DeleteNotificationData(int64_t notification_id,
                               const GURL& origin,
                               const DeleteResultCallback& callback) override;
+  void ReadAllNotificationDataForServiceWorkerRegistration(
+      const GURL& origin,
+      int64_t service_worker_registration_id,
+      const ReadAllResultCallback& callback) override;
 
   // ServiceWorkerContextObserver implementation.
   void OnRegistrationDeleted(int64_t registration_id,
@@ -100,6 +104,14 @@ class CONTENT_EXPORT PlatformNotificationContextImpl
                               const GURL& origin,
                               const ReadResultCallback& callback);
 
+  // Actually reads all notification data from the database. Must only be
+  // called on the |task_runner_| thread. |callback| will be invoked on the
+  // IO thread when the operation has completed.
+  void DoReadAllNotificationDataForServiceWorkerRegistration(
+      const GURL& origin,
+      int64_t service_worker_registration_id,
+      const ReadAllResultCallback& callback);
+
   // Actually writes the notification database to the database. Must only be
   // called on the |task_runner_| thread. |callback| will be invoked on the
   // IO thread when the operation has completed.