Add test for StringToCode and StringToWideString.

core/src/fpdfapi/fpdf_font/font_int.h

 // 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 CORE_SRC_FPDFAPI_FPDF_FONT_FONT_INT_H_
 #define CORE_SRC_FPDFAPI_FPDF_FONT_FONT_INT_H_
 
 #include <map>
@@ skipping 156 matching lines @@
 class CPDF_ToUnicodeMap {
  public:
   void Load(CPDF_Stream* pStream);
   CFX_WideString Lookup(FX_DWORD charcode);
   FX_DWORD ReverseLookup(FX_WCHAR unicode);
 
  protected:
   std::map<FX_DWORD, FX_DWORD> m_Map;
   CPDF_CID2UnicodeMap* m_pBaseMap;
   CFX_WideTextBuf m_MultiCharBuf;
+
+ private:
+  friend class fpdf_font_StringToCode_Test;
+  friend class fpdf_font_StringToWideString_Test;
+
+  static FX_DWORD StringToCode(const CFX_ByteStringC& str);
+  static CFX_WideString StringToWideString(const CFX_ByteStringC& str);
 };
 class CPDF_FontCharMap : public CFX_CharMap {
  public:
   CPDF_FontCharMap(CPDF_Font* pFont);
   CPDF_Font* m_pFont;
 };
 
 void FPDFAPI_LoadCID2UnicodeMap(CIDSet charset,
                                 const FX_WORD*& pMap,
                                 FX_DWORD& count);
 
 #endif  // CORE_SRC_FPDFAPI_FPDF_FONT_FONT_INT_H_