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diff --git a/content/plugin/npobject_util.h b/content/plugin/npobject_util.h
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+// Copyright (c) 2006-2008 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.
+//
+// Helper functions that are used by the NPObject proxy and stub.
+
+#ifndef CONTENT_PLUGIN_NPOBJECT_UTIL_H_
+#define CONTENT_PLUGIN_NPOBJECT_UTIL_H_
+#pragma once
+
+#include "build/build_config.h"
+
+#if defined(OS_WIN)
+#include <windows.h>
+#endif
+
+#include "content/plugin/npobject_stub.h"
+
+class GURL;
+class NPObjectProxy;
+class PluginChannelBase;
+
+struct _NPVariant;
+struct NPIdentifier_Param;
+struct NPVariant_Param;
+
+typedef _NPVariant NPVariant;
+typedef void *NPIdentifier;
+
+// Needs to be called early in the plugin process lifetime, before any
+// plugin instances are initialized.
+void PatchNPNFunctions();
+
+// Returns true if the current process is a plugin process, or false if it's a
+// renderer process.
+bool IsPluginProcess();
+
+// Creates an object similar to NPIdentifier that can be marshalled.
+void CreateNPIdentifierParam(NPIdentifier id, NPIdentifier_Param* param);
+
+// Creates an NPIdentifier from the marshalled object.
+NPIdentifier CreateNPIdentifier(const  NPIdentifier_Param& param);
+
+// Creates an object similar to NPVariant that can be marshalled.
+// If the containing NPObject happens to be an NPObject, then a stub
+// is created around it and param holds the routing id for it.
+// If release is true, the NPVariant object is released (except if
+// it contains an NPObject, since the stub will manage its lifetime).
+void CreateNPVariantParam(const NPVariant& variant,
+                          PluginChannelBase* channel,
+                          NPVariant_Param* param,
+                          bool release,
+                          gfx::NativeViewId containing_window,
+                          const GURL& page_url);
+
+// Creates an NPVariant from the marshalled object.
+// Returns true on success.
+bool CreateNPVariant(const NPVariant_Param& param,
+                     PluginChannelBase* channel,
+                     NPVariant* result,
+                     gfx::NativeViewId containing_window,
+                     const GURL& page_url);
+
+#if defined(OS_WIN)
+// Given a plugin's HWND, returns an event associated with the TabContents
+// that's set when inside a messagebox.  This tells the plugin process that
+// the message queue should be pumped (as what would happen if everything was
+// in-process).  This avoids deadlocks when a plugin invokes javascript that
+// causes a message box to come up.
+HANDLE GetMessageBoxEvent(HWND hwnd);
+#endif  // defined(OS_WIN)
+
+#endif  // CONTENT_PLUGIN_NPOBJECT_UTIL_H_