Clean up CPDF_Page.

core/fpdfapi/fpdf_page/cpdf_tilingpattern.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_FPDF_PAGE_CPDF_TILINGPATTERN_H_
 #define CORE_FPDFAPI_FPDF_PAGE_CPDF_TILINGPATTERN_H_
 
+#include <memory>
+
 #include "core/fpdfapi/fpdf_page/cpdf_pattern.h"
 #include "core/fxcrt/include/fx_coordinates.h"
 #include "core/fxcrt/include/fx_system.h"
 
 class CPDF_Document;
 class CPDF_Form;
 class CPDF_Object;
 
 class CPDF_TilingPattern : public CPDF_Pattern {
  public:
   CPDF_TilingPattern(CPDF_Document* pDoc,
                      CPDF_Object* pPatternObj,
                      const CFX_Matrix* parentMatrix);
   ~CPDF_TilingPattern() override;
 
+  CPDF_TilingPattern* AsTilingPattern() override { return this; }
+  CPDF_ShadingPattern* AsShadingPattern() override { return nullptr; }
+
   FX_BOOL Load();
 
-  FX_BOOL m_bColored;
+  bool colored() const { return m_bColored; }
+  const CFX_FloatRect& bbox() const { return m_BBox; }
+  FX_FLOAT x_step() const { return m_XStep; }
+  FX_FLOAT y_step() const { return m_YStep; }
+  CPDF_Form* form() const { return m_pForm.get(); }
+
+ private:
+  bool m_bColored;
   CFX_FloatRect m_BBox;
   FX_FLOAT m_XStep;
   FX_FLOAT m_YStep;
-  CPDF_Form* m_pForm;
+  std::unique_ptr<CPDF_Form> m_pForm;
 };
 
 #endif  // CORE_FPDFAPI_FPDF_PAGE_CPDF_TILINGPATTERN_H_