[Experimental] Supporting OOPIF printing

content/public/browser/notification_types.h

 // Copyright (c) 2012 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_NOTIFICATION_TYPES_H_
 #define CONTENT_PUBLIC_BROWSER_NOTIFICATION_TYPES_H_
 
 // This file describes various types used to describe and filter notifications
 // that pass through the NotificationService.
 //
@@ skipping 161 matching lines @@
   // or not an editable node was focused.
   NOTIFICATION_FOCUS_CHANGED_IN_PAGE,
 
   // Notification from WebContents that we have received a response from the
   // renderer in response to a dom automation controller action. The source is
   // the RenderViewHost, and the details is a string with the response.
   NOTIFICATION_DOM_OPERATION_RESPONSE,
 
   // Custom notifications used by the embedder should start from here.
   NOTIFICATION_CONTENT_END,
+
+  NOTIFICATION_PRINT_SUBFRAME_BEGIN,
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_NOTIFICATION_TYPES_H_