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

ppapi/shared_impl/ppp_instance_combined.cc

+// 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.
+
+#include "ppapi/shared_impl/ppp_instance_combined.h"
+
+namespace ppapi {
+
+PPP_Instance_Combined::PPP_Instance_Combined(
+    const PPP_Instance_0_5& instance_if)
+    : PPP_Instance_0_5(instance_if),
+      GetInstanceObject_0_4(NULL) {
+}
+
+PPP_Instance_Combined::PPP_Instance_Combined(
+    const PPP_Instance_0_4& instance_if)
+    : PPP_Instance_0_5(),  // Zero-initialize.
+      GetInstanceObject_0_4(instance_if.GetInstanceObject) {
+  DidCreate = instance_if.DidCreate;
+  DidDestroy = instance_if.DidDestroy;
+  DidChangeView = instance_if.DidChangeView;
+  DidChangeFocus = instance_if.DidChangeFocus;
+  HandleInputEvent = instance_if.HandleInputEvent;
+  HandleDocumentLoad = instance_if.HandleDocumentLoad;
+}
+
+}  // namespace ppapi
+