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diff --git a/fpdfsdk/src/javascript/JS_Runtime.h b/fpdfsdk/src/javascript/JS_Runtime.h
new file mode 100644
index 0000000000..ac8c532b53
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+++ b/fpdfsdk/src/javascript/JS_Runtime.h
@@ -0,0 +1,72 @@
+// 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_SRC_JAVASCRIPT_JS_RUNTIME_H_
+#define FPDFSDK_SRC_JAVASCRIPT_JS_RUNTIME_H_
+
+#include <set>
+#include <utility>
+
+#include "../../../core/include/fxcrt/fx_basic.h"
+#include "../../include/javascript/IJavaScript.h"
+#include "../../include/jsapi/fxjs_v8.h"
+#include "JS_EventHandler.h"
+
+class CJS_Context;
+
+class CJS_Runtime : public IFXJS_Runtime {
+ public:
+  class Observer {
+   public:
+    virtual void OnDestroyed() = 0;
+
+   protected:
+    virtual ~Observer() {}
+  };
+
+  using FieldEvent = std::pair<CFX_WideString, JS_EVENT_T>;
+
+  explicit CJS_Runtime(CPDFDoc_Environment* pApp);
+  ~CJS_Runtime() override;
+
+  // IFXJS_Runtime
+  IFXJS_Context* NewContext() override;
+  void ReleaseContext(IFXJS_Context* pContext) override;
+  IFXJS_Context* GetCurrentContext() override;
+  void SetReaderDocument(CPDFSDK_Document* pReaderDoc) override;
+  CPDFSDK_Document* GetReaderDocument() override { return m_pDocument; }
+
+  CPDFDoc_Environment* GetReaderApp() const { return m_pApp; }
+
+  // Returns true if the event isn't already found in the set.
+  bool AddEventToSet(const FieldEvent& event);
+  void RemoveEventFromSet(const FieldEvent& event);
+
+  void BeginBlock() { m_bBlocking = TRUE; }
+  void EndBlock() { m_bBlocking = FALSE; }
+  FX_BOOL IsBlocking() const { return m_bBlocking; }
+
+  v8::Isolate* GetIsolate() const { return m_isolate; }
+  v8::Local<v8::Context> NewJSContext();
+
+  void AddObserver(Observer* observer);
+  void RemoveObserver(Observer* observer);
+
+ private:
+  void DefineJSObjects();
+
+  CFX_ArrayTemplate<CJS_Context*> m_ContextArray;
+  CPDFDoc_Environment* m_pApp;
+  CPDFSDK_Document* m_pDocument;
+  FX_BOOL m_bBlocking;
+  std::set<FieldEvent> m_FieldEventSet;
+  v8::Isolate* m_isolate;
+  bool m_isolateManaged;
+  v8::Global<v8::Context> m_context;
+  std::set<Observer*> m_observers;
+};
+
+#endif  // FPDFSDK_SRC_JAVASCRIPT_JS_RUNTIME_H_