Use string pools in some dictionaries

core/fpdfapi/fpdf_parser/include/cpdf_dictionary.h

Index: core/fpdfapi/fpdf_parser/include/cpdf_dictionary.h
diff --git a/core/fpdfapi/fpdf_parser/include/cpdf_dictionary.h b/core/fpdfapi/fpdf_parser/include/cpdf_dictionary.h
index 784d49714f5dee024cc966bb6996956354235b17..6d05467312ddee0e134db4eec0fc1ef0ece63c2b 100644
--- a/core/fpdfapi/fpdf_parser/include/cpdf_dictionary.h
+++ b/core/fpdfapi/fpdf_parser/include/cpdf_dictionary.h
@@ -11,6 +11,7 @@
 #include <set>
 
 #include "core/fpdfapi/fpdf_parser/include/cpdf_object.h"
+#include "core/fxcrt/include/cfx_string_pool_template.h"
 #include "core/fxcrt/include/fx_coordinates.h"
 #include "core/fxcrt/include/fx_string.h"
 
@@ -21,7 +22,7 @@ class CPDF_Dictionary : public CPDF_Object {
   using iterator = std::map<CFX_ByteString, CPDF_Object*>::iterator;
   using const_iterator = std::map<CFX_ByteString, CPDF_Object*>::const_iterator;
 
-  CPDF_Dictionary();
+  CPDF_Dictionary(CFX_ByteStringPool* pPool);
 
   // CPDF_Object.
   Type GetType() const override;
@@ -83,13 +84,17 @@ class CPDF_Dictionary : public CPDF_Object {
   const_iterator begin() const { return m_Map.begin(); }
   const_iterator end() const { return m_Map.end(); }
 
+  CFX_ByteStringPool* GetByteStringPool() const { return m_pPool; }
+
  protected:
   ~CPDF_Dictionary() override;
 
+  CFX_ByteString MaybeIntern(const CFX_ByteString& str);
   CPDF_Object* CloneNonCyclic(
       bool bDirect,
       std::set<const CPDF_Object*>* visited) const override;
 
+  CFX_ByteStringPool* const m_pPool;
   std::map<CFX_ByteString, CPDF_Object*> m_Map;
 };