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diff --git a/xfa/fwl/core/cfwl_msgmousewheel.h b/xfa/fwl/core/cfwl_msgmousewheel.h
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+// Copyright 2016 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#ifndef XFA_FWL_CORE_CFWL_MSGMOUSEWHEEL_H_
+#define XFA_FWL_CORE_CFWL_MSGMOUSEWHEEL_H_
+
+#include "xfa/fwl/core/cfwl_message.h"
+
+class CFWL_MsgMouseWheel : public CFWL_Message {
+ public:
+ CFWL_MsgMouseWheel();
+ ~CFWL_MsgMouseWheel() override;
+
+ // CFWL_Message
+ std::unique_ptr<CFWL_Message> Clone() override;
+ CFWL_MessageType GetClassID() const override;
+
+ FX_FLOAT m_fx;
+ FX_FLOAT m_fy;
+ FX_FLOAT m_fDeltaX;
+ FX_FLOAT m_fDeltaY;
+ uint32_t m_dwFlags;
+};
+
+#endif // XFA_FWL_CORE_CFWL_MSGMOUSEWHEEL_H_