Make o.o.p. proxy handle PPP_Instance versions 0.4 and 0.5.

ppapi/shared_impl/ppp_instance_combined.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_SHARED_IMPL_PPP_INSTANCE_COMBINED_H_
+#define PPAPI_SHARED_IMPL_PPP_INSTANCE_COMBINED_H_
+
+#include "base/basictypes.h"
+#include "ppapi/c/ppp_instance.h"
+
+namespace ppapi {
+
+struct PPP_Instance_Combined : public PPP_Instance_0_5 {
+ public:
+  explicit PPP_Instance_Combined(const PPP_Instance_0_5& instance_if);
+  explicit PPP_Instance_Combined(const PPP_Instance_0_4& instance_if);
+
+  PP_Var (*const GetInstanceObject_0_4)(PP_Instance instance);
+
+  DISALLOW_COPY_AND_ASSIGN(PPP_Instance_Combined);
+};
+
+}  // namespace ppapi
+
+#endif  // PPAPI_SHARED_IMPL_PPP_INSTANCE_COMBINED_H_
+