Pdfium does not create isolate when it runs in chromium

fpdfsdk/include/fpdfxfa/fpdfxfa_app.h

 // Copyright 2014 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
 
 #ifndef FPDFXFA_APP_H_
 #define FPDFXFA_APP_H_
 
 #include "xfa/include/fxfa/fxfa.h"
 
 class IFXJS_Runtime;
 
 class CPDFXFA_App : public IXFA_AppProvider {
  public:
   static CPDFXFA_App* GetInstance();
   static void ReleaseInstance();
 
   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);
   FX_BOOL RemoveFormFillEnv(CPDFDoc_Environment* pEnv);
 
   FX_BOOL IsJavaScriptInitialized() const { return m_bJavaScriptInitialized; }
   void SetJavaScriptInitialized(FX_BOOL bInitialized) {
     m_bJavaScriptInitialized = bInitialized;
   }
 
@@ skipping 52 matching lines @@
 
  protected:
   static CPDFXFA_App* g_pApp;
 
   FX_BOOL m_bJavaScriptInitialized;
   IXFA_App* m_pXFAApp;
   IXFA_FontMgr* m_pFontMgr;
   FXJSE_HRUNTIME m_hJSERuntime;
   IFXJS_Runtime* m_pJSRuntime;
   CFX_WideString m_csAppType;
+  bool m_bOwnedRuntime;
 };
 
 #endif  // FPDFXFA_APP_H_