Pdfium does not create isolate when it runs in chromium

fpdfsdk/include/fpdfxfa/fpdfxfa_app.h

Index: fpdfsdk/include/fpdfxfa/fpdfxfa_app.h
diff --git a/fpdfsdk/include/fpdfxfa/fpdfxfa_app.h b/fpdfsdk/include/fpdfxfa/fpdfxfa_app.h
index dd65042189c3af32c1546e7b322bcb51c4f1074f..5ec6de5644e28a6e7eff8db06903cc1842431a24 100644
--- a/fpdfsdk/include/fpdfxfa/fpdfxfa_app.h
+++ b/fpdfsdk/include/fpdfxfa/fpdfxfa_app.h
@@ -19,7 +19,7 @@ class CPDFXFA_App : public IXFA_AppProvider {
   CPDFXFA_App();
   ~CPDFXFA_App() override;
 
-  FX_BOOL Initialize();
+  FX_BOOL Initialize(FXJSE_HRUNTIME hRuntime);
   IXFA_App* GetXFAApp() { return m_pXFAApp; }
 
   FX_BOOL AddFormFillEnv(CPDFDoc_Environment* pEnv);
@@ -92,6 +92,7 @@ class CPDFXFA_App : public IXFA_AppProvider {
   FXJSE_HRUNTIME m_hJSERuntime;
   IFXJS_Runtime* m_pJSRuntime;
   CFX_WideString m_csAppType;
+  bool m_bOwnedRuntime;
 };
 
 #endif  // FPDFXFA_APP_H_