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diff --git a/webkit/plugins/ppapi/npobject_var.h b/webkit/plugins/ppapi/npobject_var.h
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+++ b/webkit/plugins/ppapi/npobject_var.h
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+// Copyright (c) 2011 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 WEBKIT_PLUGINS_PPAPI_NPOBJECT_VAR_H_
+#define WEBKIT_PLUGINS_PPAPI_NPOBJECT_VAR_H_
+
+#include <string>
+
+#include "base/compiler_specific.h"
+#include "ppapi/c/pp_instance.h"
+#include "ppapi/c/pp_module.h"
+#include "ppapi/shared_impl/var.h"
+
+typedef struct NPObject NPObject;
+typedef struct _NPVariant NPVariant;
+typedef void* NPIdentifier;
+
+namespace ppapi {
+
+// NPObjectVar -----------------------------------------------------------------
+
+// Represents a JavaScript object Var. By itself, this represents random
+// NPObjects that a given plugin (identified by the resource's module) wants to
+// reference. If two different modules reference the same NPObject (like the
+// "window" object), then there will be different NPObjectVar's (and hence
+// PP_Var IDs) for each module. This allows us to track all references owned by
+// a given module and free them when the plugin exits independently of other
+// plugins that may be running at the same time.
+class NPObjectVar : public Var {
+ public:
+  // You should always use FromNPObject to create an NPObjectVar. This function
+  // guarantees that we maintain the 1:1 mapping between NPObject and
+  // NPObjectVar.
+  NPObjectVar(PP_Module module, PP_Instance instance, NPObject* np_object);
+
+  virtual ~NPObjectVar();
+
+  // Var overrides.
+  virtual NPObjectVar* AsNPObjectVar() OVERRIDE;
+  virtual PP_Var GetPPVar() OVERRIDE;
+
+  // Returns the underlying NPObject corresponding to this NPObjectVar.
+  // Guaranteed non-NULL.
+  NPObject* np_object() const { return np_object_; }
+
+  // Notification that the instance was deleted, the internal reference will be
+  // zeroed out.
+  void InstanceDeleted();
+
+  // Possibly 0 if the object has outlived its instance.
+  PP_Instance pp_instance() const { return pp_instance_; }
+
+  // Helper function that converts a PP_Var to an object. This will return NULL
+  // if the PP_Var is not of object type or the object is invalid.
+  static scoped_refptr<NPObjectVar> FromPPVar(PP_Var var);
+
+ private:
+  // Possibly 0 if the object has outlived its instance.
+  PP_Instance pp_instance_;
+
+  // Guaranteed non-NULL, this is the underlying object used by WebKit. We
+  // hold a reference to this object.
+  NPObject* np_object_;
+
+  DISALLOW_COPY_AND_ASSIGN(NPObjectVar);
+};
+
+}  // namespace
+
+#endif  // WEBKIT_PLUGINS_PPAPI_NPOBJECT_VAR_H_