Add a private PPB_Talk_Private interface.

ppapi/thunk/ppb_talk_private_api.h

+// Copyright (c) 2012 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_THUNK_PPB_TALK_PRIVATE_API_H_
+#define PPAPI_THUNK_PPB_TALK_PRIVATE_API_H_
+
+#include "ppapi/thunk/ppapi_thunk_export.h"
+
+namespace ppapi {
+namespace thunk {
+
+class PPAPI_THUNK_EXPORT PPB_Talk_Private_API {
+ public:
+  virtual ~PPB_Talk_Private_API() {}
+
+  virtual int32_t GetPermission(const PP_CompletionCallback& callback) = 0;
+};
+
+}  // namespace thunk
+}  // namespace ppapi
+
+#endif  // PPAPI_THUNK_PPB_TALK_PRIVATE_API_H_