Let unresolved custom element go through CustomElementCallbackQueue.

Source/core/dom/custom/CustomElementCallbackScheduler.cpp

Index: Source/core/dom/custom/CustomElementCallbackScheduler.cpp
diff --git a/Source/core/dom/custom/CustomElementCallbackScheduler.cpp b/Source/core/dom/custom/CustomElementCallbackScheduler.cpp
index 2d36478ea86e92a6136e7c272fe8f44fb9d635e8..a6783327a481f2f668138d30366bcf008711f135 100644
--- a/Source/core/dom/custom/CustomElementCallbackScheduler.cpp
+++ b/Source/core/dom/custom/CustomElementCallbackScheduler.cpp
@@ -33,7 +33,10 @@
 
 #include "core/dom/Element.h"
 #include "core/dom/custom/CustomElementCallbackDispatcher.h"
+#include "core/dom/custom/CustomElementCallbackInvocation.h"
 #include "core/dom/custom/CustomElementLifecycleCallbacks.h"
+#include "core/dom/custom/CustomElementRegistrationContext.h"
+#include "core/dom/custom/CustomElementResolutionStep.h"
 
 namespace WebCore {
 
@@ -46,15 +49,6 @@ void CustomElementCallbackScheduler::scheduleAttributeChangedCallback(PassRefPtr
     queue->append(CustomElementCallbackInvocation::createAttributeChangedInvocation(callbacks, name, oldValue, newValue));
 }
 
-void CustomElementCallbackScheduler::scheduleCreatedCallback(PassRefPtr<CustomElementLifecycleCallbacks> callbacks, PassRefPtr<Element> element)
-{
-    if (!callbacks->hasCreatedCallback())
-        return;
-
-    CustomElementCallbackQueue* queue = instance().scheduleInCurrentElementQueue(element);
-    queue->append(CustomElementCallbackInvocation::createInvocation(callbacks, CustomElementLifecycleCallbacks::Created));
-}
-
 void CustomElementCallbackScheduler::scheduleEnteredViewCallback(PassRefPtr<CustomElementLifecycleCallbacks> callbacks, PassRefPtr<Element> element)
 {
     if (!callbacks->hasEnteredViewCallback())
@@ -73,6 +67,13 @@ void CustomElementCallbackScheduler::scheduleLeftViewCallback(PassRefPtr<CustomE
     queue->append(CustomElementCallbackInvocation::createInvocation(callbacks, CustomElementLifecycleCallbacks::LeftView));
 }
 
+void CustomElementCallbackScheduler::scheduleResolutionStep(const CustomElementDescriptor& descriptor, PassRefPtr<Element> element)
+{
+    RefPtr<CustomElementRegistrationContext> context = element->document().registrationContext();
+    CustomElementCallbackQueue* queue = instance().schedule(element);
+    queue->append(CustomElementResolutionStep::create(context.release(), descriptor));
+}
+
 CustomElementCallbackScheduler& CustomElementCallbackScheduler::instance()
 {
     DEFINE_STATIC_LOCAL(CustomElementCallbackScheduler, instance, ());