Share Custom Element registration contexts between related documents.

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 6e4dd4022ace29a341997bc8a903b0a0c0468971..532c4e628d0206067ddd9bb23fd92fcf3a7a0351 100644
--- a/Source/bindings/v8/CustomElementConstructorBuilder.cpp
+++ b/Source/bindings/v8/CustomElementConstructorBuilder.cpp
@@ -144,11 +144,11 @@ bool CustomElementConstructorBuilder::findTagName(const AtomicString& customElem
     return false;
 }
 
-PassRefPtr<CustomElementLifecycleCallbacks> CustomElementConstructorBuilder::createCallbacks(Document* document)
+PassRefPtr<CustomElementLifecycleCallbacks> CustomElementConstructorBuilder::createCallbacks()
 {
     ASSERT(!m_prototype.IsEmpty());
 
-    RefPtr<Document> protect(document);
+    RefPtr<ScriptExecutionContext> scriptExecutionContext = toScriptExecutionContext(m_context);
 
     v8::TryCatch exceptionCatcher;
     exceptionCatcher.SetVerbose(true);
@@ -159,7 +159,7 @@ PassRefPtr<CustomElementLifecycleCallbacks> CustomElementConstructorBuilder::cre
     v8::Handle<v8::Function> leftDocument = retrieveCallback(isolate, "leftDocumentCallback");
     v8::Handle<v8::Function> attributeChanged = retrieveCallback(isolate, "attributeChangedCallback");
 
-    return V8CustomElementLifecycleCallbacks::create(document, m_prototype, created, enteredDocument, leftDocument, attributeChanged);
+    return V8CustomElementLifecycleCallbacks::create(scriptExecutionContext.get(), m_prototype, created, enteredDocument, leftDocument, attributeChanged);
 }
 
 v8::Handle<v8::Function> CustomElementConstructorBuilder::retrieveCallback(v8::Isolate* isolate, const char* name)