split CPDF_StreamContentParser::AddImage() into 3 overloads.

core/fpdfapi/parser/cpdf_stream.h

Index: core/fpdfapi/parser/cpdf_stream.h
diff --git a/core/fpdfapi/parser/cpdf_stream.h b/core/fpdfapi/parser/cpdf_stream.h
index ed266778b3deea211946724f618cf30a03f0d73a..575a9ebe0b2ac40c58e2a06a44bbe1f7a3dab185 100644
--- a/core/fpdfapi/parser/cpdf_stream.h
+++ b/core/fpdfapi/parser/cpdf_stream.h
@@ -58,6 +58,8 @@ class CPDF_Stream : public CPDF_Object {
   IFX_FileRead* m_pFile = nullptr;
 };
 
+using UniqueStream = std::unique_ptr<CPDF_Stream, ReleaseDeleter<CPDF_Stream>>;
+
 inline CPDF_Stream* ToStream(CPDF_Object* obj) {
   return obj ? obj->AsStream() : nullptr;
 }