Start proxying CPDFSDK_Document methods through CPDFSDK_FormFillEnvironment

fpdfsdk/cpdfsdk_formfillenvironment.h

Index: fpdfsdk/cpdfsdk_formfillenvironment.h
diff --git a/fpdfsdk/cpdfsdk_formfillenvironment.h b/fpdfsdk/cpdfsdk_formfillenvironment.h
index e92537eee128cb4ae1bf4a200b701648f0e3f2a6..b0ff2775613ffbe5cddabe42eb0598232629289d 100644
--- a/fpdfsdk/cpdfsdk_formfillenvironment.h
+++ b/fpdfsdk/cpdfsdk_formfillenvironment.h
@@ -14,15 +14,21 @@
 #include "core/fpdfdoc/cpdf_occontext.h"
 #include "core/fxcrt/cfx_observable.h"
 #include "fpdfsdk/cfx_systemhandler.h"
+#include "fpdfsdk/cpdfsdk_document.h"
 #include "fpdfsdk/fsdk_define.h"
 #include "public/fpdf_formfill.h"
 #include "public/fpdf_fwlevent.h"
 
+#ifdef PDF_ENABLE_XFA
+#include "fpdfsdk/fpdfxfa/cpdfxfa_document.h"
+#endif  // PDF_ENABLE_XFA
+
 class CFFL_InteractiveFormFiller;
 class CFX_SystemHandler;
 class CPDFSDK_ActionHandler;
 class CPDFSDK_AnnotHandlerMgr;
 class CPDFSDK_Document;
+class CPDFSDK_InterForm;
 class IJS_Runtime;
 
 class CPDFSDK_FormFillEnvironment final {
@@ -148,6 +154,12 @@ class CPDFSDK_FormFillEnvironment final {
 
   FX_BOOL IsJSInitiated() const { return m_pInfo && m_pInfo->m_pJsPlatform; }
   CPDFSDK_Document* GetSDKDocument() const { return m_pSDKDoc.get(); }
+#ifdef PDF_ENABLE_XFA
+  CPDFXFA_Document* GetXFADocument() const {
+    return m_pSDKDoc->GetXFADocument();
+  }
+#endif  // PDF_ENABLE_XFA
+
   UnderlyingDocumentType* GetUnderlyingDocument() const {
     return m_pUnderlyingDoc;
   }
@@ -155,6 +167,8 @@ class CPDFSDK_FormFillEnvironment final {
   CFX_SystemHandler* GetSysHandler() const { return m_pSysHandler.get(); }
   FPDF_FORMFILLINFO* GetFormFillInfo() const { return m_pInfo; }
 
+  CPDFSDK_InterForm* GetInterForm() const;
+
   // Creates if not present.
   CFFL_InteractiveFormFiller* GetInteractiveFormFiller();
   CPDFSDK_AnnotHandlerMgr* GetAnnotHandlerMgr();  // Creates if not present.