Unify var tracking between webkit and the proxy.

ppapi/proxy/proxy_object_var.h

+// 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 PPAPI_PROXY_PROXY_OBJECT_VAR_H_
+#define PPAPI_PROXY_PROXY_OBJECT_VAR_H_
+
+#include "base/compiler_specific.h"
+#include "ppapi/shared_impl/var.h"
+
+namespace pp {
+namespace proxy {
+class PluginDispatcher;
+}  // namespace proxy
+}  // namespace pp
+
+namespace ppapi {
+
+// Tracks a reference to an object var in the plugin side of the proxy. This
+// just stores the dispatcher and host var ID, and provides the interface for
+// integrating this with PP_Var creation.
+class ProxyObjectVar : public Var {
+ public:
+  ProxyObjectVar(pp::proxy::PluginDispatcher* dispatcher,
+                 int32 host_var_id);
+
+  virtual ~ProxyObjectVar();
+
+  // Var overrides.
+  virtual ProxyObjectVar* AsProxyObjectVar() OVERRIDE;
+  virtual PP_Var GetPPVar() OVERRIDE;
+  virtual PP_VarType GetType() const OVERRIDE;
+
+  pp::proxy::PluginDispatcher* dispatcher() const { return dispatcher_; }
+  int32 host_var_id() const { return host_var_id_; }
+
+  // Expose AssignVarID on Var so the PluginResourceTracker can call us when
+  // it's creating IDs.
+  void AssignVarID(int32 id);
+
+ private:
+  pp::proxy::PluginDispatcher* dispatcher_;
+  int32 host_var_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(ProxyObjectVar);
+};
+
+}  // namespace ppapi
+
+#endif  // PPAPI_PROXY_PROXY_OBJECT_VAR_H_