Make CPDF_ImageObject::m_Matrix private.

core/fpdfapi/page/cpdf_imageobject.h

 // Copyright 2016 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_FPDFAPI_PAGE_CPDF_IMAGEOBJECT_H_
 #define CORE_FPDFAPI_PAGE_CPDF_IMAGEOBJECT_H_
 
 #include <memory>
@@ skipping 14 matching lines @@
   void Transform(const CFX_Matrix& matrix) override;
   bool IsImage() const override;
   CPDF_ImageObject* AsImage() override;
   const CPDF_ImageObject* AsImage() const override;
 
   void CalcBoundingBox();
   CPDF_Image* GetImage() const { return m_pImage; }
   void SetOwnedImage(std::unique_ptr<CPDF_Image> pImage);
   void SetUnownedImage(CPDF_Image* pImage);
 
-  CFX_Matrix m_Matrix;
+  void set_matrix(const CFX_Matrix& matrix) { m_Matrix = matrix; }
+  const CFX_Matrix& matrix() const { return m_Matrix; }
 
  private:
   void Release();
 
+  CFX_Matrix m_Matrix;
   CPDF_Image* m_pImage;
   bool m_pImageOwned;
 };
 
 #endif  // CORE_FPDFAPI_PAGE_CPDF_IMAGEOBJECT_H_