Start proxying CPDFSDK_Document methods through CPDFSDK_FormFillEnvironment

fpdfsdk/cpdfsdk_formfillenvironment.cpp

 // 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
 
 #include "fpdfsdk/cpdfsdk_formfillenvironment.h"
 
 #include <memory>
 
 #include "fpdfsdk/cpdfsdk_annothandlermgr.h"
 #include "fpdfsdk/cpdfsdk_document.h"
+#include "fpdfsdk/cpdfsdk_interform.h"
 #include "fpdfsdk/formfiller/cffl_interactiveformfiller.h"
 #include "fpdfsdk/fsdk_actionhandler.h"
 #include "fpdfsdk/javascript/ijs_runtime.h"
 #include "third_party/base/ptr_util.h"
 
 #ifdef PDF_ENABLE_XFA
 #include "fpdfsdk/fpdfxfa/cpdfxfa_app.h"
 #endif  // PDF_ENABLE_XFA
 
 namespace {
@@ skipping 522 matching lines @@
   delete[] pbuff;
   return wsRet;
 }
 
 void CPDFSDK_FormFillEnvironment::PageEvent(int iPageCount,
                                             uint32_t dwEventType) const {
   if (m_pInfo && m_pInfo->FFI_PageEvent)
     m_pInfo->FFI_PageEvent(m_pInfo, iPageCount, dwEventType);
 }
 #endif  // PDF_ENABLE_XFA
+
+CPDFSDK_InterForm* CPDFSDK_FormFillEnvironment::GetInterForm() const {
+  return m_pSDKDoc->GetInterForm();
+}