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

fpdfsdk/src/fpdfxfa/fpdfxfa_page.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/include/fpdfapi/cpdf_document.h"
 #include "fpdfsdk/include/fpdfxfa/fpdfxfa_doc.h"
 #include "fpdfsdk/include/fpdfxfa/fpdfxfa_page.h"
 #include "fpdfsdk/include/fpdfxfa/fpdfxfa_util.h"
 #include "fpdfsdk/include/fsdk_define.h"
 #include "fpdfsdk/include/fsdk_mgr.h"
 
 CPDFXFA_Page::CPDFXFA_Page(CPDFXFA_Document* pDoc, int page_index)
     : m_pPDFPage(NULL),
       m_pXFAPageView(NULL),
       m_iPageIndex(page_index),
@@ skipping 221 matching lines @@
     case DOCTYPE_PDF:
     case DOCTYPE_STATIC_XFA: {
       if (m_pPDFPage) {
         m_pPDFPage->GetDisplayMatrix(matrix, xPos, yPos, xSize, ySize, iRotate);
       }
     } break;
     default:
       return;
   }
 }