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diff --git a/fxjs/cfxjse_isolatetracker.h b/fxjs/cfxjse_isolatetracker.h
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+++ b/fxjs/cfxjse_isolatetracker.h
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+// Copyright 2016 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_CFXJSE_ISOLATETRACKER_H_
+#define FXJS_CFXJSE_ISOLATETRACKER_H_
+
+#include <vector>
+
+#include "v8/include/v8.h"
+
+#include "fxjs/cfxjse_runtimedata.h"
+
+class CFXJSE_ScopeUtil_IsolateHandle {
+ public:
+  explicit CFXJSE_ScopeUtil_IsolateHandle(v8::Isolate* pIsolate)
+      : m_isolate(pIsolate), m_iscope(pIsolate), m_hscope(pIsolate) {}
+  v8::Isolate* GetIsolate() { return m_isolate; }
+
+ private:
+  CFXJSE_ScopeUtil_IsolateHandle(const CFXJSE_ScopeUtil_IsolateHandle&) =
+      delete;
+  void operator=(const CFXJSE_ScopeUtil_IsolateHandle&) = delete;
+  void* operator new(size_t size) = delete;
+  void operator delete(void*, size_t) = delete;
+
+  v8::Isolate* m_isolate;
+  v8::Isolate::Scope m_iscope;
+  v8::HandleScope m_hscope;
+};
+
+class CFXJSE_ScopeUtil_IsolateHandleRootContext {
+ public:
+  explicit CFXJSE_ScopeUtil_IsolateHandleRootContext(v8::Isolate* pIsolate)
+      : m_parent(pIsolate),
+        m_cscope(v8::Local<v8::Context>::New(
+            pIsolate,
+            CFXJSE_RuntimeData::Get(pIsolate)->m_hRootContext)) {}
+
+ private:
+  CFXJSE_ScopeUtil_IsolateHandleRootContext(
+      const CFXJSE_ScopeUtil_IsolateHandleRootContext&) = delete;
+  void operator=(const CFXJSE_ScopeUtil_IsolateHandleRootContext&) = delete;
+  void* operator new(size_t size) = delete;
+  void operator delete(void*, size_t) = delete;
+
+  CFXJSE_ScopeUtil_IsolateHandle m_parent;
+  v8::Context::Scope m_cscope;
+};
+
+class CFXJSE_IsolateTracker {
+ public:
+  typedef void (*DisposeCallback)(v8::Isolate*, bool bOwnedIsolate);
+
+  CFXJSE_IsolateTracker();
+  ~CFXJSE_IsolateTracker();
+
+  void Append(v8::Isolate* pIsolate);
+  void Remove(v8::Isolate* pIsolate, DisposeCallback lpfnDisposeCallback);
+  void RemoveAll(DisposeCallback lpfnDisposeCallback);
+
+  static CFXJSE_IsolateTracker* g_pInstance;
+
+ protected:
+  std::vector<v8::Isolate*> m_OwnedIsolates;
+};
+
+#endif  // FXJS_CFXJSE_ISOLATETRACKER_H_