Process Custom Elements in post-order.

Source/core/dom/CustomElementObserver.cpp

Index: Source/core/dom/CustomElementObserver.cpp
diff --git a/Source/core/dom/CustomElementObserver.cpp b/Source/core/dom/CustomElementObserver.cpp
index d4a9fba28427bcab561b929bd53811ab4d38c3a7..45f1350d963e005e893db63a25b031643a27da5d 100644
--- a/Source/core/dom/CustomElementObserver.cpp
+++ b/Source/core/dom/CustomElementObserver.cpp
@@ -39,6 +39,14 @@ CustomElementObserver::ElementObserverMap& CustomElementObserver::elementObserve
     return map;
 }
 
+void CustomElementObserver::notifyElementDidFinishParsingChildren(Element* element)
+{
+    ElementObserverMap::iterator it = elementObservers().find(element);
+    if (it == elementObservers().end())
+        return;
+    it->value->elementDidFinishParsingChildren(element);
+}
+
 void CustomElementObserver::notifyElementWasDestroyed(Element* element)
 {
     ElementObserverMap::iterator it = elementObservers().find(element);