Add SetProperty() in the PPB_Transport_Dev interface.

ppapi/cpp/dev/transport_dev.cc

Index: ppapi/cpp/dev/transport_dev.cc
diff --git a/ppapi/cpp/dev/transport_dev.cc b/ppapi/cpp/dev/transport_dev.cc
index b625a7d7c02645b118b0b2ec765efdd16965b1fb..e72583841e5a5a053a0a9b690a5d9a3480772829 100644
--- a/ppapi/cpp/dev/transport_dev.cc
+++ b/ppapi/cpp/dev/transport_dev.cc
@@ -36,6 +36,14 @@ bool Transport_Dev::IsWritable() {
       get_interface<PPB_Transport_Dev>()->IsWritable(pp_resource()));
 }
 
+int32_t Transport_Dev::SetProperty(PP_TransportProperty property,
+                                   const Var& value) {
+  if (!has_interface<PPB_Transport_Dev>())
+    return PP_ERROR_NOINTERFACE;
+  return get_interface<PPB_Transport_Dev>()->SetProperty(
+      pp_resource(), property, value.pp_var());
+}
+
 int32_t Transport_Dev::Connect(const CompletionCallback& cc) {
   if (!has_interface<PPB_Transport_Dev>())
     return cc.MayForce(PP_ERROR_NOINTERFACE);