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

Source/bindings/dart/DartCustomElementWrapper.h

Index: Source/bindings/dart/DartCustomElementWrapper.h
diff --git a/Source/modules/filesystem/DataTransferItemFileSystem.h b/Source/bindings/dart/DartCustomElementWrapper.h
similarity index 75%
copy from Source/modules/filesystem/DataTransferItemFileSystem.h
copy to Source/bindings/dart/DartCustomElementWrapper.h
index f4a93122936541f05a749bd29e62c1d330d2524a..1ac0566743440682a5864ae2374a6d45378645e1 100644
--- a/Source/modules/filesystem/DataTransferItemFileSystem.h
+++ b/Source/bindings/dart/DartCustomElementWrapper.h
@@ -28,26 +28,31 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef DataTransferItemFileSystem_h
-#define DataTransferItemFileSystem_h
+#ifndef DartCustomElementWrapper_h
+#define DartCustomElementWrapper_h
 
 #include "wtf/PassRefPtr.h"
 
+#include <dart_api.h>
+
 namespace WebCore {
 
-class DataTransferItem;
-class Entry;
-class ScriptExecutionContext;
+class HTMLElement;
+class SVGElement;
 
-class DataTransferItemFileSystem {
+template<typename ElementType>
+class DartCustomElementWrapper {
 public:
-    static PassRefPtr<Entry> webkitGetAsEntry(ScriptExecutionContext*, DataTransferItem*);
-
+    static Dart_Handle upgradeDartWrapper(ElementType*);
 private:
-    DataTransferItemFileSystem();
-    ~DataTransferItemFileSystem();
+    DartCustomElementWrapper();
+
+    friend Dart_Handle createDartHTMLWrapper(HTMLElement*);
+    friend Dart_Handle createDartSVGWrapper(SVGElement*);
+
+    static Dart_Handle wrap(PassRefPtr<ElementType>, Dart_Handle (*createSpecificWrapper)(ElementType* element));
 };
 
 } // namespace WebCore
 
-#endif // DataTransferItemFileSystem_h
+#endif // CustomElementWrapper_h