Track all changed nodes during an update

content/public/browser/ax_event_notification_details.cc

 // 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.
 
 #include "content/public/browser/ax_event_notification_details.h"
 
 namespace content {
 
 AXEventNotificationDetails::AXEventNotificationDetails()
     : event_type(ui::AX_EVENT_NONE),
       id(-1),
-      ax_tree_id(-1) {
-}
+      ax_tree_id(-1),
+      event_from(ui::AX_EVENT_FROM_NONE) {}
 
 AXEventNotificationDetails::AXEventNotificationDetails(
     const AXEventNotificationDetails& other) = default;
 
 AXEventNotificationDetails::~AXEventNotificationDetails() {}
 
 AXLocationChangeNotificationDetails::AXLocationChangeNotificationDetails()
     : id(-1),
       ax_tree_id(-1) {
 }
 
 AXLocationChangeNotificationDetails::AXLocationChangeNotificationDetails(
     const AXLocationChangeNotificationDetails& other) = default;
 
 AXLocationChangeNotificationDetails::~AXLocationChangeNotificationDetails() {}
 
 
 }  // namespace content