Add tests for CMap_GetCode and CMap_GetCodeRange.

core/src/fpdfapi/fpdf_font/font_int.h

Index: core/src/fpdfapi/fpdf_font/font_int.h
diff --git a/core/src/fpdfapi/fpdf_font/font_int.h b/core/src/fpdfapi/fpdf_font/font_int.h
index 559027b283e1d0c1f106076ea8be0cca2c3c7a98..c7a00dccc90db25676b2e47f520ae8d93e17b32c 100644
--- a/core/src/fpdfapi/fpdf_font/font_int.h
+++ b/core/src/fpdfapi/fpdf_font/font_int.h
@@ -77,6 +77,14 @@ class CPDF_CMapParser {
   CFX_BinaryBuf m_AddMaps;
 
  private:
+  friend class fpdf_font_cid_CMap_GetCode_Test;
+  friend class fpdf_font_cid_CMap_GetCodeRange_Test;
+
+  static FX_DWORD CMap_GetCode(const CFX_ByteStringC& word);
+  static bool CMap_GetCodeRange(CMap_CodeRange& range,
+                                const CFX_ByteStringC& first,
+                                const CFX_ByteStringC& second);
+
   CPDF_CMap* m_pCMap;
   int m_Status;
   int m_CodeSeq;