Track all changed nodes during an update

content/public/browser/ax_event_notification_details.h

 // Copyright 2014 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_AX_EVENT_NOTIFICATION_DETAILS_H_
 #define CONTENT_PUBLIC_BROWSER_AX_EVENT_NOTIFICATION_DETAILS_H_
 
 #include <vector>
 
 #include "content/common/content_export.h"
 #include "ui/accessibility/ax_node_data.h"
 #include "ui/accessibility/ax_relative_bounds.h"
 #include "ui/accessibility/ax_tree_data.h"
 #include "ui/accessibility/ax_tree_update.h"
 
 namespace content {
 
 // Use this object in conjunction with the
 // |WebContentsObserver::AccessibilityEventReceived| method.
 struct CONTENT_EXPORT AXEventNotificationDetails {
  public:
   AXEventNotificationDetails();
   AXEventNotificationDetails(const AXEventNotificationDetails& other);
   ~AXEventNotificationDetails();
 
   ui::AXTreeUpdate update;
   ui::AXEvent event_type;
   int id;
   int ax_tree_id;
+  ui::AXEventFrom event_from;
 };
 
 // Use this object in conjunction with the
 // |WebContentsObserver::AccessibilityLocationChangeReceived| method.
 struct CONTENT_EXPORT AXLocationChangeNotificationDetails {
  public:
   AXLocationChangeNotificationDetails();
   AXLocationChangeNotificationDetails(
       const AXLocationChangeNotificationDetails& other);
   ~AXLocationChangeNotificationDetails();
 
   int id;
   int ax_tree_id;
   ui::AXRelativeBounds new_location;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_AX_EVENT_NOTIFICATION_DETAILS_H_