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diff --git a/xfa/src/fwl/core/fwl_threadimp.h b/xfa/src/fwl/core/fwl_threadimp.h
new file mode 100644
index 0000000000..eaf30e6350
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+++ b/xfa/src/fwl/core/fwl_threadimp.h
@@ -0,0 +1,40 @@
+// Copyright 2014 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_SRC_FWL_CORE_FWL_THREADIMP_H_
+#define XFA_SRC_FWL_CORE_FWL_THREADIMP_H_
+
+#include "xfa/include/fwl/core/fwl_thread.h"  // For FWL_HTHREAD.
+
+class CFWL_NoteDriver;
+class IFWL_NoteDriver;
+
+class CFWL_ThreadImp {
+ public:
+  virtual ~CFWL_ThreadImp() {}
+  IFWL_Thread* GetInterface() const { return m_pIface; }
+  virtual FWL_ERR Run(FWL_HTHREAD hThread);
+
+ protected:
+  CFWL_ThreadImp(IFWL_Thread* pIface) : m_pIface(pIface) {}
+
+ private:
+  IFWL_Thread* const m_pIface;
+};
+
+class CFWL_NoteThreadImp : public CFWL_ThreadImp {
+ public:
+  CFWL_NoteThreadImp(IFWL_NoteThread* pIface);
+  virtual ~CFWL_NoteThreadImp();
+
+  FWL_ERR Run(FWL_HTHREAD hThread) override;
+  virtual IFWL_NoteDriver* GetNoteDriver();
+
+ protected:
+  CFWL_NoteDriver* const m_pNoteDriver;
+};
+
+#endif  // XFA_SRC_FWL_CORE_FWL_THREADIMP_H_