Make CPDF_Object subclass constructors intern strings

core/fpdfapi/parser/cpdf_indirect_object_holder.h

Index: core/fpdfapi/parser/cpdf_indirect_object_holder.h
diff --git a/core/fpdfapi/parser/cpdf_indirect_object_holder.h b/core/fpdfapi/parser/cpdf_indirect_object_holder.h
index 375010de93ea9b5c57b4f1bf16142b4d4ec97f5b..a78e6663b376c09d0d217eb7f31450bc4c9f6767 100644
--- a/core/fpdfapi/parser/cpdf_indirect_object_holder.h
+++ b/core/fpdfapi/parser/cpdf_indirect_object_holder.h
@@ -9,14 +9,14 @@
 
 #include <map>
 #include <memory>
+#include <type_traits>
 
+#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_system.h"
 #include "third_party/base/ptr_util.h"
 
-class CPDF_Object;
-
 class CPDF_IndirectObjectHolder {
  public:
   using const_iterator =
@@ -30,11 +30,19 @@ class CPDF_IndirectObjectHolder {
   void DeleteIndirectObject(uint32_t objnum);
 
   // Creates and adds a new object owned by the indirect object holder,
-  // and returns an unowned pointer to it.
+  // and returns an unowned pointer to it.  We have a special case to
+  // handle objects that can intern strings from our ByteStringPool.
   template <typename T, typename... Args>
-  T* NewIndirect(Args... args) {
+  typename std::enable_if<!CanInternStrings<T>::value, T*>::type NewIndirect(
+      Args... args) {
     return static_cast<T*>(AddIndirectObject(pdfium::MakeUnique<T>(args...)));
   }
+  template <typename T, typename... Args>
+  typename std::enable_if<CanInternStrings<T>::value, T*>::type NewIndirect(
+      Args... args) {
+    return static_cast<T*>(
+        AddIndirectObject(pdfium::MakeUnique<T>(m_pByteStringPool, args...)));
+  }
 
   // Takes ownership of |pObj|, returns unowned pointer to it.
   CPDF_Object* AddIndirectObject(std::unique_ptr<CPDF_Object> pObj);