Implement custom element construction and some 'define' checks

third_party/WebKit/Source/core/dom/custom/V0CustomElementRegistry.cpp

Index: third_party/WebKit/Source/core/dom/custom/V0CustomElementRegistry.cpp
diff --git a/third_party/WebKit/Source/core/dom/custom/V0CustomElementRegistry.cpp b/third_party/WebKit/Source/core/dom/custom/V0CustomElementRegistry.cpp
index 2ecc455436fc31c9a4b2539d45094f9b81ccd7f3..b7b4a4061e9cc4a8feaee9e5f631a782927b9616 100644
--- a/third_party/WebKit/Source/core/dom/custom/V0CustomElementRegistry.cpp
+++ b/third_party/WebKit/Source/core/dom/custom/V0CustomElementRegistry.cpp
@@ -31,13 +31,31 @@
 #include "core/dom/custom/V0CustomElementRegistry.h"
 
 #include "bindings/core/v8/V0CustomElementConstructorBuilder.h"
+#include "bindings/core/v8/V8Binding.h"
 #include "core/HTMLNames.h"
 #include "core/SVGNames.h"
+#include "core/dom/Document.h"
+#include "core/dom/custom/CustomElementsRegistry.h"
 #include "core/dom/custom/V0CustomElementException.h"
 #include "core/dom/custom/V0CustomElementRegistrationContext.h"
+#include "core/frame/LocalDOMWindow.h"
 
 namespace blink {
 
+static bool v1CustomElementIsDefined(const AtomicString& name)
+{
+    v8::Isolate* isolate = v8::Isolate::GetCurrent();
+    Document* doc = toDocument(currentExecutionContext(isolate));
+    LocalDOMWindow* window = doc->domWindow();
+    CustomElementsRegistry* registry = window->customElements();
+    return registry && registry->nameIsDefined(name);
+}
+
+bool V0CustomElementRegistry::nameIsDefined(const AtomicString& name) const
+{
+    return m_registeredTypeNames.contains(name);
+}
+
 V0CustomElementDefinition* V0CustomElementRegistry::registerElement(Document* document, V0CustomElementConstructorBuilder* constructorBuilder, const AtomicString& userSuppliedName, V0CustomElement::NameSet validNames, ExceptionState& exceptionState)
 {
     AtomicString type = userSuppliedName.lower();
@@ -52,7 +70,7 @@ V0CustomElementDefinition* V0CustomElementRegistry::registerElement(Document* do
         return 0;
     }
 
-    if (m_registeredTypeNames.contains(type)) {
+    if (m_registeredTypeNames.contains(type) || v1CustomElementIsDefined(type)) {
         V0CustomElementException::throwException(V0CustomElementException::TypeAlreadyRegistered, type, exceptionState);
         return 0;
     }