Split off CPDF_Document into its own .cpp/.h files.

core/src/fpdfapi/fpdf_render/fpdf_render.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 "core/src/fpdfapi/fpdf_render/render_int.h"
 
+#include "core/include/fpdfapi/cpdf_document.h"
 #include "core/include/fpdfapi/fpdf_module.h"
 #include "core/include/fpdfapi/fpdf_render.h"
 #include "core/include/fxge/fx_ge.h"
 #include "core/src/fpdfapi/fpdf_page/pageint.h"
 
 CPDF_DocRenderData::CPDF_DocRenderData(CPDF_Document* pPDFDoc)
     : m_pPDFDoc(pPDFDoc), m_pFontCache(new CFX_FontCache) {}
 
 CPDF_DocRenderData::~CPDF_DocRenderData() {
   Clear(TRUE);
@@ skipping 1308 matching lines @@
   for (int i = 0; i < nItems; i++) {
     const CPDF_ContentMarkItem& item = pData->GetItem(i);
     if (item.GetName() == "OC" &&
         item.GetParamType() == CPDF_ContentMarkItem::PropertiesDict &&
         !CheckOCGVisible(item.GetParam())) {
       return FALSE;
     }
   }
   return TRUE;
 }