Add prebuilt pdfium library for windows use

dependencies/pdfium/public/fpdf_searchex.h

@@ -0,0 +1,30 @@
+// 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 PUBLIC_FPDF_SEARCHEX_H_
+#define PUBLIC_FPDF_SEARCHEX_H_
+
+// NOLINTNEXTLINE(build/include)
+#include "fpdfview.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif  // __cplusplus
+
+// Get the character index in |text_page| internal character list.
+//
+//   text_page  - a text page information structure.
+//   nTextIndex - index of the text returned from |FPDFText_GetText|.
+//
+// Returns the index of the character in internal character list. -1 for error.
+DLLEXPORT int STDCALL
+FPDFText_GetCharIndexFromTextIndex(FPDF_TEXTPAGE text_page, int nTextIndex);
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif  // __cplusplus
+
+#endif  // PUBLIC_FPDF_SEARCHEX_H_