[CSS Regions] Add new regionOversetChange event

Source/core/rendering/RegionOversetState.h

-/**
- * (C) 1999-2003 Lars Knoll (knoll@kde.org)
- * Copyright (C) 2004, 2006 Apple Computer, Inc.
- *
+/*
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
+ *
  */
-#include "config.h"
-#include "core/css/StyleSheet.h"
+
+#ifndef RegionOversetState_h
+#define RegionOversetState_h
 
 namespace WebCore {
 
-StyleSheet::~StyleSheet()
-{
-}
+enum RegionOversetState {
+    RegionUndefined,
+    RegionEmpty,
+    RegionFit,
+    RegionOverset
+};
 
-}
+} // namespace WebCore
+
+#endif // RegionOversetState_h