fpdfsdk/ differences with XFA (for didactic purposes only).

fpdfsdk/src/javascript/JS_Runtime.h

Index: fpdfsdk/src/javascript/JS_Runtime.h
diff --git a/fpdfsdk/src/javascript/JS_Runtime.h b/fpdfsdk/src/javascript/JS_Runtime.h
index fcac7a9021b3a33ad33116eca543febdec71c58e..6de2b705a5053c1be4fe32adaf6ef3ef511708f6 100644
--- a/fpdfsdk/src/javascript/JS_Runtime.h
+++ b/fpdfsdk/src/javascript/JS_Runtime.h
@@ -58,6 +58,14 @@ class CJS_Runtime : public IJS_Runtime {
   v8::Isolate* GetIsolate() const { return m_isolate; }
   v8::Local<v8::Context> NewJSContext();
 
+#ifdef PDF_ENABLE_XFA
+  // IJS_Runtime:
+  FX_BOOL GetHValueByName(const CFX_ByteStringC& utf8Name,
+                          FXJSE_HVALUE hValue) override;
+  FX_BOOL SetHValueByName(const CFX_ByteStringC& utf8Name,
+                          FXJSE_HVALUE hValue) override;
+
+#endif
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);