Implement Custom Elements' entered and left document callbacks.

Source/bindings/v8/CustomElementConstructorBuilder.cpp

Index: Source/bindings/v8/CustomElementConstructorBuilder.cpp
diff --git a/Source/bindings/v8/CustomElementConstructorBuilder.cpp b/Source/bindings/v8/CustomElementConstructorBuilder.cpp
index 337d10a1ffb647c8b423c5cd8750b47ed5a82518..3a05d61072155add4bc4b771b4ff40cf03d9d509 100644
--- a/Source/bindings/v8/CustomElementConstructorBuilder.cpp
+++ b/Source/bindings/v8/CustomElementConstructorBuilder.cpp
@@ -151,9 +151,11 @@ PassRefPtr<CustomElementLifecycleCallbacks> CustomElementConstructorBuilder::cre
 
     v8::Isolate* isolate = v8::Isolate::GetCurrent();
     v8::Handle<v8::Function> created = retrieveCallback(isolate, "createdCallback");
+    v8::Handle<v8::Function> enteredDocument = retrieveCallback(isolate, "enteredDocumentCallback");
+    v8::Handle<v8::Function> leftDocument = retrieveCallback(isolate, "leftDocumentCallback");
     v8::Handle<v8::Function> attributeChanged = retrieveCallback(isolate, "attributeChangedCallback");
 
-    return V8CustomElementLifecycleCallbacks::create(document, m_prototype, created, attributeChanged);
+    return V8CustomElementLifecycleCallbacks::create(document, m_prototype, created, enteredDocument, leftDocument, attributeChanged);
 }
 
 v8::Handle<v8::Function> CustomElementConstructorBuilder::retrieveCallback(v8::Isolate* isolate, const char* name)