Start proxying CPDFSDK_Document methods through CPDFSDK_FormFillEnvironment

fpdfsdk/fpdfxfa/cpdfxfa_document.cpp

Index: fpdfsdk/fpdfxfa/cpdfxfa_document.cpp
diff --git a/fpdfsdk/fpdfxfa/cpdfxfa_document.cpp b/fpdfsdk/fpdfxfa/cpdfxfa_document.cpp
index bd7f931c5970b2d7278bcbafd996a9552a7e2c90..18e5ce3da2774353bb41f40ba2250b56ee076bc5 100644
--- a/fpdfsdk/fpdfxfa/cpdfxfa_document.cpp
+++ b/fpdfsdk/fpdfxfa/cpdfxfa_document.cpp
@@ -201,3 +201,7 @@ void CPDFXFA_Document::ClearChangeMark() {
   if (m_pSDKDoc)
     m_pSDKDoc->ClearChangeMark();
 }
+
+CPDFSDK_FormFillEnvironment* CPDFXFA_Document::GetFormFillEnv() const {
+  return m_pSDKDoc ? m_pSDKDoc->GetEnv() : nullptr;
+}