Add DISABLE_TCP_TRANSPORT flag in the Transport API.

remoting/protocol/pepper_stream_channel.cc

Index: remoting/protocol/pepper_stream_channel.cc
diff --git a/remoting/protocol/pepper_stream_channel.cc b/remoting/protocol/pepper_stream_channel.cc
index 49d38f6c142f1ca095ddf022b2f33908e557bf54..0f97950291ca9240b367f6f9ced55c66ce2097d0 100644
--- a/remoting/protocol/pepper_stream_channel.cc
+++ b/remoting/protocol/pepper_stream_channel.cc
@@ -116,6 +116,8 @@ void PepperStreamChannel::Connect(pp::Instance* pp_instance,
     LOG(ERROR) << "Failed to set TCP ACK delay.";
   }
 
+  int32 protocols = PP_TRANSPORTPROTOCOL_UDP;
+
   if (transport_config.nat_traversal) {
     if (transport->SetProperty(
             PP_TRANSPORTPROPERTY_STUN_SERVER,
@@ -140,6 +142,13 @@ void PepperStreamChannel::Connect(pp::Instance* pp_instance,
             pp::Var(PP_TRANSPORTRELAYMODE_GOOGLE)) != PP_OK) {
       LOG(ERROR) << "Failed to set relay mode.";
     }
+
+    protocols |= PP_TRANSPORTPROTOCOL_STUN | PP_TRANSPORTPROTOCOL_RELAY_UDP;
+  }
+
+  if (transport->SetProperty(PP_TRANSPORTPROPERTY_PROTOCOLS,
+                             pp::Var(protocols)) != PP_OK) {
+    LOG(ERROR) << "Failed to set port types.";
   }
 
   channel_ = new PepperTransportSocketAdapter(transport, name_, this);