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diff --git a/fxjs/cjs_v8.h b/fxjs/cjs_v8.h
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+// Copyright 2017 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 FXJS_CJS_V8_H_
+#define FXJS_CJS_V8_H_
+
+#include <v8-util.h>
+#include <v8.h>
+
+#include <map>
+#include <vector>
+
+#include "core/fxcrt/bytestring.h"
+#include "core/fxcrt/fx_string.h"
+#include "core/fxcrt/widestring.h"
+
+class CJS_V8 {
+ public:
+  explicit CJS_V8(v8::Isolate* pIsolate);
+  virtual ~CJS_V8();
+
+  v8::Isolate* GetIsolate() const { return m_isolate; }
+
+  v8::Local<v8::Context> NewLocalContext();
+  v8::Local<v8::Context> GetPersistentContext();
+
+  v8::Local<v8::Value> NewNull();
+  v8::Local<v8::Value> NewUndefined();
+  v8::Local<v8::Array> NewArray();
+  v8::Local<v8::Number> NewNumber(int number);
+  v8::Local<v8::Number> NewNumber(double number);
+  v8::Local<v8::Number> NewNumber(float number);
+  v8::Local<v8::Boolean> NewBoolean(bool b);
+  v8::Local<v8::String> NewString(const ByteStringView& str);
+  v8::Local<v8::String> NewString(const WideStringView& str);
+  v8::Local<v8::Date> NewDate(double d);
+
+  int ToInt32(v8::Local<v8::Value> pValue);
+  bool ToBoolean(v8::Local<v8::Value> pValue);
+  double ToDouble(v8::Local<v8::Value> pValue);
+  WideString ToWideString(v8::Local<v8::Value> pValue);
+  v8::Local<v8::Object> ToObject(v8::Local<v8::Value> pValue);
+  v8::Local<v8::Array> ToArray(v8::Local<v8::Value> pValue);
+
+  // Arrays.
+  unsigned GetArrayLength(v8::Local<v8::Array> pArray);
+  v8::Local<v8::Value> GetArrayElement(v8::Local<v8::Array> pArray,
+                                       unsigned index);
+  unsigned PutArrayElement(v8::Local<v8::Array> pArray,
+                           unsigned index,
+                           v8::Local<v8::Value> pValue);
+
+  void SetConstArray(const WideString& name, v8::Local<v8::Array> array);
+  v8::Local<v8::Array> GetConstArray(const WideString& name);
+
+  // Objects.
+  std::vector<WideString> GetObjectPropertyNames(v8::Local<v8::Object> pObj);
+  v8::Local<v8::Value> GetObjectProperty(v8::Local<v8::Object> pObj,
+                                         const WideString& PropertyName);
+  void PutObjectProperty(v8::Local<v8::Object> pObj,
+                         const WideString& PropertyName,
+                         v8::Local<v8::Value> pValue);
+
+ protected:
+  void SetIsolate(v8::Isolate* pIsolate) { m_isolate = pIsolate; }
+  void ClearConstArray() { m_ConstArrays.clear(); }
+
+  void ResetPersistentContext(v8::Local<v8::Context> context) {
+    m_V8PersistentContext.Reset(m_isolate, context);
+  }
+  void ReleasePersistentContext() { m_V8PersistentContext.Reset(); }
+
+ private:
+  v8::Isolate* m_isolate;
+  std::map<WideString, v8::Global<v8::Array>> m_ConstArrays;
+  v8::Global<v8::Context> m_V8PersistentContext;
+};
+
+#endif  // FXJS_CJS_V8_H_