Reduce duplicated code in CPDF_Document by adding auxiliary methods

core/fpdfapi/fpdf_parser/include/cpdf_document.h

Index: core/fpdfapi/fpdf_parser/include/cpdf_document.h
diff --git a/core/fpdfapi/fpdf_parser/include/cpdf_document.h b/core/fpdfapi/fpdf_parser/include/cpdf_document.h
index 494868ef135ce1e2759b47d7a6a0930f2b23c806..54e3f955e95d25eb5f7901a38da9ba65ba9edcc1 100644
--- a/core/fpdfapi/fpdf_parser/include/cpdf_document.h
+++ b/core/fpdfapi/fpdf_parser/include/cpdf_document.h
@@ -128,6 +128,12 @@ class CPDF_Document : public CPDF_IndirectObjectHolder {
   void LoadDocInternal();
   size_t CalculateEncodingDict(int charset, CPDF_Dictionary* pBaseDict);
   CPDF_Dictionary* GetPagesDict() const;
+  CPDF_Dictionary* ProcessbCJK(
+      CPDF_Dictionary* pBaseDict,
+      int charset,
+      FX_BOOL bVert,
+      CFX_ByteString basefont,
+      std::function<void(FX_WCHAR, FX_WCHAR, CPDF_Array*)> Insert);
 };
 
 #endif  // CORE_FPDFAPI_FPDF_PARSER_INCLUDE_CPDF_DOCUMENT_H_