IWYU in core/src/fpdfapi/fpdf_page/pageint.h.

core/src/fpdfapi/fpdf_page/pageint.h

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #ifndef CORE_SRC_FPDFAPI_FPDF_PAGE_PAGEINT_H_
 #define CORE_SRC_FPDFAPI_FPDF_PAGE_PAGEINT_H_
 
 #include <map>
 #include <memory>
+#include <vector>
 
 #include "core/include/fpdfapi/fpdf_page.h"
 #include "core/include/fpdfapi/fpdf_pageobj.h"
 
 class CPDF_AllStates;
 class CPDF_ParseOptions;
 
 #define PARSE_STEP_LIMIT 100
 
 class CPDF_StreamParser {
@@ skipping 428 matching lines @@
   CPDF_ColorSpace* GetBaseCS() const override;
 
  private:
   CPDF_ColorSpace* m_pBaseCS;
   CPDF_CountedColorSpace* m_pCountedBaseCS;
 };
 
 void PDF_ReplaceAbbr(CPDF_Object* pObj);
 
 #endif  // CORE_SRC_FPDFAPI_FPDF_PAGE_PAGEINT_H_