Add SetProperty() in the PPB_Transport_Dev interface.

ppapi/cpp/dev/transport_dev.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_CPP_DEV_TRANSPORT_DEV_H_
 #define PPAPI_CPP_DEV_TRANSPORT_DEV_H_
 
 #include "ppapi/c/dev/ppb_transport_dev.h"
 #include "ppapi/cpp/completion_callback.h"
 #include "ppapi/cpp/resource.h"
 
 namespace pp {
 
 class Instance;
 class Var;
 
 class Transport_Dev : public Resource {
  public:
   Transport_Dev(Instance* instance, const char* name, const char* proto);
 
   bool IsWritable();
+  int32_t SetConfig(const char* config);
   int32_t Connect(const CompletionCallback& cc);
   int32_t GetNextAddress(pp::Var* address, const CompletionCallback& cc);
   int32_t ReceiveRemoteAddress(const pp::Var& address);
   int32_t Recv(void* data, uint32_t len,
                const CompletionCallback& cc);
   int32_t Send(const void* data, uint32_t len,
                const CompletionCallback& cb);
   int32_t Close();
 };
 
 }  // namespace pp
 
 #endif  // PPAPI_CPP_DEV_TRANSPORT_DEV_H_