1 files changed, 14 insertions, 1 deletions
diff --git a/dom/interfaces/events/nsIDOMEventTarget.idl b/dom/interfaces/events/nsIDOMEventTarget.idl
index a7e3aae5a4..9e00c598c3 100644
--- a/dom/interfaces/events/nsIDOMEventTarget.idl
+++ b/dom/interfaces/events/nsIDOMEventTarget.idl
@@ -13,6 +13,7 @@
 using mozilla::dom::Nullable;
 
 namespace mozilla {
+class EventChainVisitor;
 class EventChainPostVisitor;
 class EventChainPreVisitor;
 class EventListenerManager;
@@ -224,7 +225,19 @@ interface nsIDOMEventTarget : nsISupports
    * @note Only EventDispatcher should call this method.
    */
   [noscript, nostdcall]
-  void PreHandleEvent(in EventChainPreVisitorRef aVisitor);
+  void GetEventTargetParent(in EventChainPreVisitorRef aVisitor);
+
+  /**
+   * Called before the capture phase of the event flow and after event target
+   * chain creation. This is used to handle those stuffs must be executed before
+   * dispatch event to DOM
+   */
+%{C++
+  virtual nsresult PreHandleEvent(mozilla::EventChainVisitor& aVisitor)
+  {
+    return NS_OK;
+  }
+%}
 
   /**
    * If EventChainPreVisitor.mWantsWillHandleEvent is set PR_TRUE,