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diff --git a/content/child/npapi/npobject_stub.h b/content/child/npapi/npobject_stub.h
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+++ b/content/child/npapi/npobject_stub.h
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+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// A class that receives IPC messages from an NPObjectProxy and calls the real
+// NPObject.
+
+#ifndef CONTENT_CHILD_NPAPI_NPOBJECT_STUB_H_
+#define CONTENT_CHILD_NPAPI_NPOBJECT_STUB_H_
+
+#include <vector>
+
+#include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
+#include "content/child/npapi/npobject_base.h"
+#include "ipc/ipc_listener.h"
+#include "ipc/ipc_sender.h"
+#include "url/gurl.h"
+
+struct NPObject;
+
+namespace content {
+class NPChannelBase;
+struct NPIdentifier_Param;
+struct NPVariant_Param;
+
+// This wraps an NPObject and converts IPC messages from NPObjectProxy to calls
+// to the object.  The results are marshalled back.  See npobject_proxy.h for
+// more information.
+class NPObjectStub : public IPC::Listener,
+                     public IPC::Sender,
+                     public base::SupportsWeakPtr<NPObjectStub>,
+                     public NPObjectBase {
+ public:
+  NPObjectStub(NPObject* npobject,
+               NPChannelBase* channel,
+               int route_id,
+               int render_view_id,
+               const GURL& page_url);
+  virtual ~NPObjectStub();
+
+  // Schedules tear-down of this stub.  The underlying NPObject reference is
+  // released, and further invokations from the IPC channel will fail once this
+  // call has returned.  Deletion of the stub is deferred to the main loop, in
+  // case it is touched as the stack unwinds.  DeleteSoon() is safe to call
+  // more than once, until control returns to the main loop.
+  void DeleteSoon();
+
+  // IPC::Sender implementation:
+  virtual bool Send(IPC::Message* msg) OVERRIDE;
+
+  // NPObjectBase implementation.
+  virtual NPObject* GetUnderlyingNPObject() OVERRIDE;
+  virtual IPC::Listener* GetChannelListener() OVERRIDE;
+
+ private:
+  // IPC::Listener implementation:
+  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
+  virtual void OnChannelError() OVERRIDE;
+
+  // message handlers
+  void OnRelease(IPC::Message* reply_msg);
+  void OnHasMethod(const NPIdentifier_Param& name,
+                   bool* result);
+  void OnInvoke(bool is_default,
+                const NPIdentifier_Param& method,
+                const std::vector<NPVariant_Param>& args,
+                IPC::Message* reply_msg);
+  void OnHasProperty(const NPIdentifier_Param& name,
+                     bool* result);
+  void OnGetProperty(const NPIdentifier_Param& name,
+                     NPVariant_Param* property,
+                     bool* result);
+  void OnSetProperty(const NPIdentifier_Param& name,
+                     const NPVariant_Param& property,
+                     IPC::Message* reply_msg);
+  void OnRemoveProperty(const NPIdentifier_Param& name,
+                        bool* result);
+  void OnInvalidate();
+  void OnEnumeration(std::vector<NPIdentifier_Param>* value,
+                     bool* result);
+  void OnConstruct(const std::vector<NPVariant_Param>& args,
+                   IPC::Message* reply_msg);
+  void OnEvaluate(const std::string& script, bool popups_allowed,
+                  IPC::Message* reply_msg);
+
+ private:
+  NPObject* npobject_;
+  scoped_refptr<NPChannelBase> channel_;
+  int route_id_;
+  int render_view_id_;
+
+  // The url of the main frame hosting the plugin.
+  GURL page_url_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_CHILD_NPAPI_NPOBJECT_STUB_H_