Make CPDF_ImageObject::m_Matrix private.

core/fpdfapi/page/cpdf_imageobject.h

Index: core/fpdfapi/page/cpdf_imageobject.h
diff --git a/core/fpdfapi/page/cpdf_imageobject.h b/core/fpdfapi/page/cpdf_imageobject.h
index fd99d3d6122ecc0f96f9de9e0b73ee1701dea408..2bb1e8233dd5a34d73ce15b1e23f9c735a8daedf 100644
--- a/core/fpdfapi/page/cpdf_imageobject.h
+++ b/core/fpdfapi/page/cpdf_imageobject.h
@@ -32,11 +32,13 @@ class CPDF_ImageObject : public CPDF_PageObject {
   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;
 };