Add the NotificationDatabaseData structure and protobuf

content/browser/notifications/notification_database_data.h

Index: content/browser/notifications/notification_database_data.h
diff --git a/content/browser/notifications/notification_database_data.h b/content/browser/notifications/notification_database_data.h
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index 0000000000000000000000000000000000000000..ea4bf3874fe7624e73de8d3cdd024bd17266ca5e
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+++ b/content/browser/notifications/notification_database_data.h
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+// 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_BROWSER_NOTIFICATIONS_NOTIFICATION_DATABASE_DATA_H_
+#define CONTENT_BROWSER_NOTIFICATIONS_NOTIFICATION_DATABASE_DATA_H_
+
+#include <stdint.h>
+
+#include "content/common/content_export.h"
+#include "content/public/common/platform_notification_data.h"
+#include "url/gurl.h"
+
+namespace content {
+
+// Stores information about a Web Notification as available in the notification
+// database. Beyond the notification's own data, its id and attribution need
+// to be available for users of the database as well.
+struct CONTENT_EXPORT NotificationDatabaseData {
+  NotificationDatabaseData();
+  ~NotificationDatabaseData();
+
+  // Parses the serialized notification database data |input| into this object.
+  bool ParseFromString(const std::string& input);
+
+  // Serializes the contents of this object to |output|. Returns if the data
+  // could be serialized successfully.
+  bool SerializeToString(std::string* output) const;
+
+  // Id of the notification as allocated by the NotificationDatabase.
+  int64_t notification_id;
+
+  // Origin of the website this notification is associated with.
+  GURL origin;
+
+  // Id of the Service Worker registration this notification is associated with.
+  int64_t service_worker_registration_id;
+
+  // Platform data of the notification that's being stored.
+  PlatformNotificationData notification_data;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_NOTIFICATIONS_NOTIFICATION_DATABASE_DATA_H_