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diff --git a/fpdfsdk/fpdfxfa/cpdfxfa_app.h b/fpdfsdk/fpdfxfa/cpdfxfa_app.h
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+++ b/fpdfsdk/fpdfxfa/cpdfxfa_app.h
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+// 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 FPDFSDK_FPDFXFA_CPDFXFA_APP_H_
+#define FPDFSDK_FPDFXFA_CPDFXFA_APP_H_
+
+#include "xfa/fxfa/fxfa.h"
+
+class CPDFSDK_Environment;
+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(v8::Isolate* pIsolate);
+  CXFA_FFApp* GetXFAApp() { return m_pXFAApp.get(); }
+
+  FX_BOOL AddFormFillEnv(CPDFSDK_Environment* pEnv);
+  FX_BOOL RemoveFormFillEnv(CPDFSDK_Environment* pEnv);
+
+  FX_BOOL IsJavaScriptInitialized() const { return m_bJavaScriptInitialized; }
+  void SetJavaScriptInitialized(FX_BOOL bInitialized) {
+    m_bJavaScriptInitialized = bInitialized;
+  }
+
+  v8::Isolate* GetJSERuntime() const { return m_pIsolate; }
+
+  // IFXA_AppProvider:
+  void GetAppType(CFX_WideString& wsAppType) override;
+  void SetAppType(const CFX_WideStringC& wsAppType) override;
+
+  void GetLanguage(CFX_WideString& wsLanguage) override;
+  void GetPlatform(CFX_WideString& wsPlatform) override;
+  void GetVariation(CFX_WideString& wsVariation) override;
+  void GetVersion(CFX_WideString& wsVersion) override;
+  void GetAppName(CFX_WideString& wsName) override;
+
+  void Beep(uint32_t dwType) override;
+  int32_t MsgBox(const CFX_WideString& wsMessage,
+                 const CFX_WideString& wsTitle,
+                 uint32_t dwIconType,
+                 uint32_t dwButtonType) override;
+  CFX_WideString Response(const CFX_WideString& wsQuestion,
+                          const CFX_WideString& wsTitle,
+                          const CFX_WideString& wsDefaultAnswer,
+                          FX_BOOL bMark) override;
+
+  IFX_FileRead* DownloadURL(const CFX_WideString& wsURL) override;
+  FX_BOOL PostRequestURL(const CFX_WideString& wsURL,
+                         const CFX_WideString& wsData,
+                         const CFX_WideString& wsContentType,
+                         const CFX_WideString& wsEncode,
+                         const CFX_WideString& wsHeader,
+                         CFX_WideString& wsResponse) override;
+  FX_BOOL PutRequestURL(const CFX_WideString& wsURL,
+                        const CFX_WideString& wsData,
+                        const CFX_WideString& wsEncode) override;
+
+  void LoadString(int32_t iStringID, CFX_WideString& wsString) override;
+  IFWL_AdapterTimerMgr* GetTimerMgr() override;
+
+  CFX_ArrayTemplate<CPDFSDK_Environment*> m_pEnvList;
+
+ protected:
+  FX_BOOL m_bJavaScriptInitialized;
+  std::unique_ptr<CXFA_FFApp> m_pXFAApp;
+  v8::Isolate* m_pIsolate;
+  CFX_WideString m_csAppType;
+};
+
+#endif  // FPDFSDK_FPDFXFA_CPDFXFA_APP_H_