Implement the ability to get all notifications in Chromium.

content/public/browser/platform_notification_context.h

 // 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.
 
 #ifndef CONTENT_PUBLIC_BROWSER_PLATFORM_NOTIFICATION_CONTEXT_H_
 #define CONTENT_PUBLIC_BROWSER_PLATFORM_NOTIFICATION_CONTEXT_H_
 
 #include <stdint.h>
+#include <vector>
 
 #include "base/callback.h"
+#include "content/public/browser/notification_database_data.h"
 
 class GURL;
 
 namespace content {
 
-struct NotificationDatabaseData;
-
 // Represents the storage context for persistent Web Notifications, specific to
 // the storage partition owning the instance. All methods defined in this
 // interface may only be used on the IO thread.
 class PlatformNotificationContext {
  public:
   using ReadResultCallback =
       base::Callback<void(bool /* success */,
                           const NotificationDatabaseData&)>;
 
+  using ReadAllResultCallback =
+      base::Callback<void(bool /* success */,
+                          const std::vector<NotificationDatabaseData>&)>;
+
   using WriteResultCallback =
       base::Callback<void(bool /* success */,
                           int64_t /* notification_id */)>;
 
   using DeleteResultCallback = base::Callback<void(bool /* success */)>;
 
   // Reads the data associated with |notification_id| belonging to |origin|
   // from the database. |callback| will be invoked with the success status
   // and a reference to the notification database data when completed.
   virtual void ReadNotificationData(int64_t notification_id,
                                     const GURL& origin,
                                     const ReadResultCallback& callback) = 0;
 
+  // Reads all data associated with |service_worker_registration_id| belonging
+  // to |origin| from the database. |callback| will be invoked with the success
+  // status and a vector with all read notification data when completed.
+  virtual void ReadAllNotificationDataForServiceWorkerRegistration(
+      const GURL& origin,
+      int64_t service_worker_registration_id,
+      const ReadAllResultCallback& callback) = 0;
+
   // Writes the data associated with a notification to a database. When this
   // action completed, |callback| will be invoked with the success status and
   // the persistent notification id when written successfully.
   virtual void WriteNotificationData(
       const GURL& origin,
       const NotificationDatabaseData& database_data,
       const WriteResultCallback& callback) = 0;
 
   // Deletes all data associated with |notification_id| belonging to |origin|
   // from the database. |callback| will be invoked with the success status
   // when the operation has completed.
   virtual void DeleteNotificationData(int64_t notification_id,
                                       const GURL& origin,
                                       const DeleteResultCallback& callback) = 0;
 
  protected:
   virtual ~PlatformNotificationContext() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_PLATFORM_NOTIFICATION_CONTEXT_H_