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diff --git a/content/renderer/pepper/plugin_object.h b/content/renderer/pepper/plugin_object.h
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+++ b/content/renderer/pepper/plugin_object.h
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+// Copyright (c) 2010 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.
+
+#ifndef CONTENT_RENDERER_PEPPER_PLUGIN_OBJECT_H_
+#define CONTENT_RENDERER_PEPPER_PLUGIN_OBJECT_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+
+struct PP_Var;
+struct PPP_Class_Deprecated;
+typedef struct NPObject NPObject;
+typedef struct _NPVariant NPVariant;
+
+namespace webkit {
+namespace ppapi {
+
+class PluginInstanceImpl;
+
+// A PluginObject is a JS-accessible object implemented by the plugin.
+//
+// In contrast, a var of type PP_VARTYPE_OBJECT is a reference to a JS object,
+// which might be implemented by the plugin (here) or by the JS engine.
+class PluginObject {
+ public:
+  virtual ~PluginObject();
+
+  // Allocates a new PluginObject and returns it as a PP_Var with a
+  // refcount of 1.
+  static PP_Var Create(PluginInstanceImpl* instance,
+                       const PPP_Class_Deprecated* ppp_class,
+                       void* ppp_class_data);
+
+  PluginInstanceImpl* instance() const { return instance_; }
+
+  const PPP_Class_Deprecated* ppp_class() { return ppp_class_; }
+  void* ppp_class_data() { return ppp_class_data_; };
+
+  NPObject* GetNPObject() const;
+
+  // Returns true if the given var is an object implemented by the same plugin
+  // that owns the var object, and that the class matches. If it matches,
+  // returns true and places the class data into |*ppp_class_data| (which can
+  // optionally be NULL if no class data is desired).
+  static bool IsInstanceOf(NPObject* np_object,
+                           const PPP_Class_Deprecated* ppp_class,
+                           void** ppp_class_data);
+
+  // Converts the given NPObject to the corresponding ObjectVar.
+  //
+  // The given NPObject must be one corresponding to a PluginObject or this
+  // will crash. If the object is a PluginObject but the plugin has gone
+  // away (the object could still be alive because of a reference from JS),
+  // then the return value will be NULL.
+  static PluginObject* FromNPObject(NPObject* object);
+
+  // Allocates a plugin wrapper object and returns it as an NPObject. This is
+  // used internally only.
+  static NPObject* AllocateObjectWrapper();
+
+ private:
+  struct NPObjectWrapper;
+
+  // This object must be created using the CreateObject function of the which
+  // will set up the correct NPObject.
+  //
+  // The NPObjectWrapper (an NPObject) should already have the reference
+  // incremented on it, and this class will take ownership of that reference.
+  PluginObject(PluginInstanceImpl* instance,
+               NPObjectWrapper* object_wrapper,
+               const PPP_Class_Deprecated* ppp_class,
+               void* ppp_class_data);
+
+  PluginInstanceImpl* instance_;
+
+  // Holds a pointer to the NPObject wrapper backing the var. This class
+  // derives from NPObject and we hold a reference to it, so it must be
+  // refcounted. When the type is not an object, this value will be NULL.
+  //
+  // We don't actually own this pointer, it's the NPObject that actually
+  // owns us.
+  NPObjectWrapper* object_wrapper_;
+
+  const PPP_Class_Deprecated* ppp_class_;
+  void* ppp_class_data_;
+
+  DISALLOW_COPY_AND_ASSIGN(PluginObject);
+};
+
+}  // namespace ppapi
+}  // namespace webkit
+
+#endif  // CONTENT_RENDERER_PEPPER_PLUGIN_OBJECT_H_