Add type cast definitions for CPDF_Stream.

core/src/fpdfapi/fpdf_render/render_int.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_RENDER_RENDER_INT_H_
 #define CORE_SRC_FPDFAPI_FPDF_RENDER_RENDER_INT_H_
 
 #include <map>
@@ skipping 529 matching lines @@
   int StartLoadMaskDIB();
   int ContinueLoadMaskDIB(IFX_Pause* pPause);
   int ContinueToLoadMask();
   CPDF_DIBSource* DetachMask();
   CPDF_DIBSource* m_pMask;
   FX_DWORD m_MatteColor;
   void* m_pJbig2Context;
   CPDF_StreamAcc* m_pGlobalStream;
   FX_BOOL m_bStdCS;
   int m_Status;
-  CPDF_Object* m_pMaskStream;
+  CPDF_Stream* m_pMaskStream;
   FX_BOOL m_bHasMask;
 
  private:
   FX_BOOL LoadColorInfo(CPDF_Dictionary* pFormResources,
                         CPDF_Dictionary* pPageResources);
   DIB_COMP_DATA* GetDecodeAndMaskArray(FX_BOOL& bDefaultDecode,
                                        FX_BOOL& bColorKey);
   CPDF_DIBSource* LoadMask(FX_DWORD& MatteColor);
   CPDF_DIBSource* LoadMaskDIB(CPDF_Stream* pMask);
   void LoadJpxBitmap();
@@ skipping 74 matching lines @@
   const uint8_t* m_RampB;
 };
 
 struct _CPDF_UniqueKeyGen {
   void Generate(int count, ...);
   FX_CHAR m_Key[128];
   int m_KeyLen;
 };
 
 #endif  // CORE_SRC_FPDFAPI_FPDF_RENDER_RENDER_INT_H_