Revert "Make m_pShadingObj a CPDF_Stream instead of CPDF_Object."

core/src/fpdfapi/fpdf_page/fpdf_page_parser.cpp

 // 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
 
 #include "../../../include/fpdfapi/fpdf_page.h"
 #include "../../../include/fpdfapi/fpdf_module.h"
 #include "../../../include/fpdfapi/fpdf_serial.h"
 #include "pageint.h"
@@ skipping 1110 matching lines @@
   SetGraphicStates(pObj, FALSE, FALSE, FALSE);
   pObj->m_Matrix = m_pCurStates->m_CTM;
   pObj->m_Matrix.Concat(m_mtContentToUser);
   CFX_FloatRect bbox;
   if (!pObj->m_ClipPath.IsNull()) {
     bbox = pObj->m_ClipPath.GetClipBox();
   } else {
     bbox = m_BBox;
   }
   if (pShading->m_ShadingType >= 4) {
-    bbox.Intersect(_GetShadingBBox(
-        pShading->m_pShadingObj, pShading->m_ShadingType, &pObj->m_Matrix,
-        pShading->m_pFunctions, pShading->m_nFuncs, pShading->m_pCS));
+    bbox.Intersect(_GetShadingBBox(ToStream(pShading->m_pShadingObj),
+                                   pShading->m_ShadingType, &pObj->m_Matrix,
+                                   pShading->m_pFunctions, pShading->m_nFuncs,
+                                   pShading->m_pCS));
   }
   pObj->m_Left = bbox.left;
   pObj->m_Right = bbox.right;
   pObj->m_Top = bbox.top;
   pObj->m_Bottom = bbox.bottom;
   m_pObjectList->m_ObjectList.AddTail(pObj);
 }
 void CPDF_StreamContentParser::Handle_SetCharSpace() {
   m_pCurStates->m_TextState.GetModify()->m_CharSpace = GetNumber(0);
 }
@@ skipping 418 matching lines @@
         buf.AppendChar((char)code);
       }
       bFirst = !bFirst;
     }
   }
   if (!bFirst) {
     buf.AppendChar((char)code);
   }
   return buf.GetByteString();
 }