Revert "Revert "Dartium changes for custom element lifecycle events.""

Source/bindings/v8/CustomElementConstructorBuilder.h

Index: Source/bindings/v8/CustomElementConstructorBuilder.h
diff --git a/Source/bindings/v8/CustomElementConstructorBuilder.h b/Source/bindings/v8/CustomElementConstructorBuilder.h
index 84e46bb568a56a6a6f8a54d0db1bdfb48638e642..f5b66c12125497f93b8281e3b6fced46a633e357 100644
--- a/Source/bindings/v8/CustomElementConstructorBuilder.h
+++ b/Source/bindings/v8/CustomElementConstructorBuilder.h
@@ -61,22 +61,23 @@ class CustomElementConstructorBuilder {
     WTF_MAKE_NONCOPYABLE(CustomElementConstructorBuilder);
 public:
     CustomElementConstructorBuilder(ScriptState*, const Dictionary* options);
+    virtual ~CustomElementConstructorBuilder() { }
 
     // The builder accumulates state and may run script at specific
     // points. These methods must be called in order. When one fails
     // (returns false), the calls must stop.
 
-    bool isFeatureAllowed() const;
-    bool validateOptions(const AtomicString& type, ExceptionState&);
-    bool findTagName(const AtomicString& customElementType, QualifiedName& tagName);
-    PassRefPtr<CustomElementLifecycleCallbacks> createCallbacks();
-    bool createConstructor(Document*, CustomElementDefinition*, ExceptionState&);
-    bool didRegisterDefinition(CustomElementDefinition*) const;
+    virtual bool isFeatureAllowed() const;
+    virtual bool validateOptions(const AtomicString& type, ExceptionState&);
+    virtual bool findTagName(const AtomicString& customElementType, QualifiedName& tagName);
+    virtual PassRefPtr<CustomElementLifecycleCallbacks> createCallbacks();
+    virtual bool createConstructor(Document*, CustomElementDefinition*, ExceptionState&);
+    virtual bool didRegisterDefinition(CustomElementDefinition*) const;
 
     // This method collects a return value for the bindings. It is
     // safe to call this method even if the builder failed; it will
     // return an empty value.
-    ScriptValue bindingsReturnValue() const;
+    virtual ScriptValue bindingsReturnValue() const;
 
 private:
     static WrapperTypeInfo* findWrapperType(v8::Handle<v8::Value> chain);