Let unresolved custom element go through CustomElementCallbackQueue.

Source/core/dom/custom/CustomElementResolutionStep.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 11 matching lines @@
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
-#include "core/dom/Microtask.h"
+#include "core/dom/custom/CustomElementResolutionStep.h"
 
-#include "core/dom/MutationObserver.h"
-#include "core/dom/custom/CustomElementCallbackDispatcher.h"
-#include "wtf/Vector.h"
+#include "core/dom/Element.h"
+#include "core/dom/custom/CustomElementRegistrationContext.h"
 
 namespace WebCore {
 
-void Microtask::performCheckpoint()
+PassOwnPtr<CustomElementResolutionStep> CustomElementResolutionStep::create(PassRefPtr<CustomElementRegistrationContext> context, const CustomElementDescriptor& descriptor)
 {
-    static bool performingCheckpoint = false;
-    if (performingCheckpoint)
-        return;
-    performingCheckpoint = true;
+    return adoptPtr(new CustomElementResolutionStep(context, descriptor));
+}
 
-    bool anyWorkDone;
-    do {
-        MutationObserver::deliverAllMutations();
-        anyWorkDone = CustomElementCallbackDispatcher::instance().dispatch();
-    } while (anyWorkDone);
+CustomElementResolutionStep::CustomElementResolutionStep(PassRefPtr<CustomElementRegistrationContext> context, const CustomElementDescriptor& descriptor)
+    : m_context(context)
+    , m_descriptor(descriptor)
+{
+}
 
-    performingCheckpoint = false;
+CustomElementResolutionStep::~CustomElementResolutionStep()
+{
+}
+
+void CustomElementResolutionStep::dispatch(Element* element)
+{
+    m_context->resolve(element, m_descriptor);
 }
 
 } // namespace WebCore