Implement custom element construction and some 'define' checks

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

Index: third_party/WebKit/Source/core/dom/custom/V0CustomElementRegistry.h
diff --git a/third_party/WebKit/Source/core/dom/custom/V0CustomElementRegistry.h b/third_party/WebKit/Source/core/dom/custom/V0CustomElementRegistry.h
index f2b6cf6aec092c4b51a7eb637baa045d6942e1df..a030766b98a56a24242281a7bdd06a889f7366f1 100644
--- a/third_party/WebKit/Source/core/dom/custom/V0CustomElementRegistry.h
+++ b/third_party/WebKit/Source/core/dom/custom/V0CustomElementRegistry.h
@@ -42,8 +42,9 @@
 
 namespace blink {
 
-class V0CustomElementConstructorBuilder;
+class CustomElementsRegistry;
 class ExceptionState;
+class V0CustomElementConstructorBuilder;
 
 class V0CustomElementRegistry final {
     WTF_MAKE_NONCOPYABLE(V0CustomElementRegistry);
@@ -60,10 +61,16 @@ protected:
     V0CustomElementDefinition* registerElement(Document*, V0CustomElementConstructorBuilder*, const AtomicString& name, V0CustomElement::NameSet validNames, ExceptionState&);
     V0CustomElementDefinition* find(const V0CustomElementDescriptor&) const;
 
+    bool nameIsDefined(const AtomicString& name) const;
+    void setV1(const CustomElementsRegistry*);
+
 private:
+    bool v1NameIsDefined(const AtomicString& name) const;
+
     typedef HeapHashMap<V0CustomElementDescriptor, Member<V0CustomElementDefinition>> DefinitionMap;
     DefinitionMap m_definitions;
     HashSet<AtomicString> m_registeredTypeNames;
+    Member<const CustomElementsRegistry> m_v1;
     bool m_documentWasDetached;
 };