Traverse PDF page tree only once in CPDF_Document

core/fpdfapi/parser/cpdf_document.h

Index: core/fpdfapi/parser/cpdf_document.h
diff --git a/core/fpdfapi/parser/cpdf_document.h b/core/fpdfapi/parser/cpdf_document.h
index c557a56013f71da4dc7106ad5faa97eb154c56ae..27971e9947cf99463441abb40b0a2c0ff928862c 100644
--- a/core/fpdfapi/parser/cpdf_document.h
+++ b/core/fpdfapi/parser/cpdf_document.h
@@ -107,10 +107,7 @@ class CPDF_Document : public CPDF_IndirectObjectHolder {
 
   // Retrieve page count information by getting count value from the tree nodes
   int RetrievePageCount() const;
-  CPDF_Dictionary* FindPDFPage(CPDF_Dictionary* pPages,
-                               int iPage,
-                               int nPagesToGo,
-                               int level);
+  void TraversePDFPages(CPDF_Dictionary* pPages, int iPage, int level);
   int FindPageIndex(CPDF_Dictionary* pNode,
                     uint32_t& skip_count,
                     uint32_t objnum,
@@ -131,6 +128,7 @@ class CPDF_Document : public CPDF_IndirectObjectHolder {
   CPDF_Dictionary* m_pRootDict;
   CPDF_Dictionary* m_pInfoDict;
   bool m_bLinearized;
+  bool m_bPagesTraversed;
   int m_iFirstPageNo;
   uint32_t m_dwFirstPageObjNum;
   // TODO(thestig): Figure out why this cannot be a std::unique_ptr.