Introduce new content APIs for persistent notifications.

chrome/browser/notifications/platform_notification_service_impl.h

Index: chrome/browser/notifications/platform_notification_service_impl.h
diff --git a/chrome/browser/notifications/platform_notification_service_impl.h b/chrome/browser/notifications/platform_notification_service_impl.h
index 51700d16e72ea1a252af73b6639d355a569a46e0..c2d08d4041d73865d1be0e6163661c224fda8000 100644
--- a/chrome/browser/notifications/platform_notification_service_impl.h
+++ b/chrome/browser/notifications/platform_notification_service_impl.h
@@ -28,6 +28,14 @@ class PlatformNotificationServiceImpl
       scoped_ptr<content::DesktopNotificationDelegate> delegate,
       int render_process_id,
       base::Closure* cancel_callback) override;
+  void DisplayPersistentNotification(
+      content::BrowserContext* browser_context,
+      int64 service_worker_registration_id,
+      const content::ShowDesktopNotificationHostMsgParams& params,
+      int render_process_id) override;
+  void ClosePersistentNotification(
+      content::BrowserContext* browser_context,
+      const std::string& persistent_notification_id) override;
 
  private:
   friend struct DefaultSingletonTraits<PlatformNotificationServiceImpl>;