Make CPDF_Object subclass constructors intern strings

core/fpdfapi/parser/cpdf_string.h

Index: core/fpdfapi/parser/cpdf_string.h
diff --git a/core/fpdfapi/parser/cpdf_string.h b/core/fpdfapi/parser/cpdf_string.h
index 1e73e8699ff3905887c69cd04e8ab4b38cdd0896..616e3b593de6a5948b680ad376922e73945088e8 100644
--- a/core/fpdfapi/parser/cpdf_string.h
+++ b/core/fpdfapi/parser/cpdf_string.h
@@ -8,13 +8,17 @@
 #define CORE_FPDFAPI_PARSER_CPDF_STRING_H_
 
 #include "core/fpdfapi/parser/cpdf_object.h"
+#include "core/fxcrt/cfx_string_pool_template.h"
+#include "core/fxcrt/cfx_weak_ptr.h"
 #include "core/fxcrt/fx_string.h"
 #include "core/fxcrt/fx_system.h"
 
 class CPDF_String : public CPDF_Object {
  public:
   CPDF_String();
-  CPDF_String(const CFX_ByteString& str, bool bHex);
+  CPDF_String(CFX_WeakPtr<CFX_ByteStringPool> pPool,
+              const CFX_ByteString& str,
+              bool bHex);
   explicit CPDF_String(const CFX_WideString& str);
   ~CPDF_String() override;