Pass accessible location change messages to the automation API.

content/public/browser/ax_event_notification_details.cc

Index: content/public/browser/ax_event_notification_details.cc
diff --git a/content/public/browser/ax_event_notification_details.cc b/content/public/browser/ax_event_notification_details.cc
index 703f76f71377d8049f3b84ed9cad4c879e75a1c6..6bc9e338885d479eefc5c83f961cae3c537f7b19 100644
--- a/content/public/browser/ax_event_notification_details.cc
+++ b/content/public/browser/ax_event_notification_details.cc
@@ -17,4 +17,15 @@ AXEventNotificationDetails::AXEventNotificationDetails(
 
 AXEventNotificationDetails::~AXEventNotificationDetails() {}
 
+AXLocationChangeNotificationDetails::AXLocationChangeNotificationDetails()
+    : id(-1),
+      ax_tree_id(-1) {
+}
+
+AXLocationChangeNotificationDetails::AXLocationChangeNotificationDetails(
+    const AXLocationChangeNotificationDetails& other) = default;
+
+AXLocationChangeNotificationDetails::~AXLocationChangeNotificationDetails() {}
+
+
 }  // namespace content