Implement Custom Elements' attributeChangedCallback.

Source/bindings/v8/CustomElementConstructorBuilder.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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 132 matching lines @@
 PassRefPtr<CustomElementLifecycleCallbacks> CustomElementConstructorBuilder::createCallbacks(Document* document)
 {
     ASSERT(!m_prototype.IsEmpty());
 
     RefPtr<Document> protect(document);
 
     v8::TryCatch exceptionCatcher;
     exceptionCatcher.SetVerbose(true);
 
     v8::Isolate* isolate = v8::Isolate::GetCurrent();
-    v8::Handle<v8::Value> createdValue = m_prototype->Get(v8String("createdCallback", isolate));
+    v8::Handle<v8::Function> created = retrieveCallback(isolate, "createdCallback");
+    v8::Handle<v8::Function> attributeChanged = retrieveCallback(isolate, "attributeChangedCallback");
 
-    v8::Handle<v8::Function> createdFunction;
-    if (!createdValue.IsEmpty() && createdValue->IsFunction())
-        createdFunction = v8::Handle<v8::Function>::Cast(createdValue);
+    return V8CustomElementLifecycleCallbacks::create(document, m_prototype, created, attributeChanged);
+}
 
-    return V8CustomElementLifecycleCallbacks::create(document, m_prototype, createdFunction);
+v8::Handle<v8::Function> CustomElementConstructorBuilder::retrieveCallback(v8::Isolate* isolate, const char* name)
+{
+    v8::Handle<v8::Value> value = m_prototype->Get(v8String(name, isolate));
+    if (value.IsEmpty() || !value->IsFunction())
+        return v8::Handle<v8::Function>();
+    return v8::Handle<v8::Function>::Cast(value);
 }
 
 bool CustomElementConstructorBuilder::createConstructor(Document* document, CustomElementDefinition* definition)
 {
     ASSERT(!m_prototype.IsEmpty());
     ASSERT(m_constructor.IsEmpty());
     ASSERT(document);
 
     v8::Isolate* isolate = m_context->GetIsolate();
 
@@ skipping 115 matching lines @@
     CustomElementCallbackDispatcher::CallbackDeliveryScope deliveryScope;
     RefPtr<Element> element = document->createElementNS(namespaceURI, name, maybeType->IsNull() ? nullAtom : type, ec);
     if (ec) {
         setDOMException(ec, isolate);
         return;
     }
     v8SetReturnValue(args, toV8Fast(element.release(), args, document));
 }
 
 } // namespace WebCore