Introduce a new API to handle native notification clicks

chrome/browser/notifications/persistent_notification_handler.h

Index: chrome/browser/notifications/persistent_notification_handler.h
diff --git a/chrome/browser/notifications/persistent_notification_handler.h b/chrome/browser/notifications/persistent_notification_handler.h
new file mode 100644
index 0000000000000000000000000000000000000000..57e9890a9a15c088bb036848d490dba1cd2ca7b4
--- /dev/null
+++ b/chrome/browser/notifications/persistent_notification_handler.h
@@ -0,0 +1,40 @@
+// Copyright 2016 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 CHROME_BROWSER_NOTIFICATIONS_PERSISTENT_NOTIFICATION_HANDLER_H_
+#define CHROME_BROWSER_NOTIFICATIONS_PERSISTENT_NOTIFICATION_HANDLER_H_
+
+#include "base/macros.h"
+#include "chrome/browser/notifications/notification_handler.h"
+#include "chrome/browser/notifications/notification_operation_common.h"
+
+// NotificationHandler implementation for persistent, service worker backed,
+// notifications.
+class PersistentNotificationHandler : public NotificationHandler {
+ public:
+  PersistentNotificationHandler();
+  ~PersistentNotificationHandler() override;
+
+  void HandleNotificationOperation(
+      notification_operation_common::NotificationOperation operation,
+      Profile* profile,
+      const std::string& origin,
+      const std::string& notification_id,
+      int action_index) override;
+
+  void RegisterNotification(
+      const std::string& notification_id,
+      std::unique_ptr<Notification> notification) override;
+
+  void CloseNotification(Profile* profile,
+                         const std::string& notification_id) override;
+
+  notification_operation_common::NotificationHandlerType NotificationType()
+      override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(PersistentNotificationHandler);
+};
+
+#endif  // CHROME_BROWSER_NOTIFICATIONS_PERSISTENT_NOTIFICATION_HANDLER_H_