Create a new preference which disables UDP protocol for WebRTC

content/renderer/p2p/port_allocator.cc

 // 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.
 
 #include "content/renderer/p2p/port_allocator.h"
 
 #include "base/command_line.h"
 #include "content/public/common/content_switches.h"
 
 namespace content {
 
-P2PPortAllocator::Config::Config()
-    : disable_tcp_transport(false) {
-}
+P2PPortAllocator::Config::Config() {}
 
 P2PPortAllocator::Config::~Config() {
 }
 
 P2PPortAllocator::Config::RelayServerConfig::RelayServerConfig()
     : port(0) {
 }
 
 P2PPortAllocator::Config::RelayServerConfig::~RelayServerConfig() {
 }
 
 P2PPortAllocator::P2PPortAllocator(
     P2PSocketDispatcher* socket_dispatcher,
     rtc::NetworkManager* network_manager,
     rtc::PacketSocketFactory* socket_factory,
     const Config& config,
     const GURL& origin)
     : cricket::BasicPortAllocator(network_manager, socket_factory),
       socket_dispatcher_(socket_dispatcher),
       config_(config),
       origin_(origin)
   {
   uint32 flags = 0;
-  if (config_.disable_tcp_transport)
-    flags |= cricket::PORTALLOCATOR_DISABLE_TCP;
   if (!config_.enable_multiple_routes)
     flags |= cricket::PORTALLOCATOR_DISABLE_ADAPTER_ENUMERATION;
+  if (!config_.enable_nonproxied_udp_transport) {
+    flags |= cricket::PORTALLOCATOR_DISABLE_UDP |
+             cricket::PORTALLOCATOR_DISABLE_STUN |
+             cricket::PORTALLOCATOR_DISABLE_UDP_RELAY;

[Sergey Ulanov, 2015/08/28 15:21:26]

So these flags disable all UDP traffic. I'm confused by "non-proxied".

+  }
   set_flags(flags);
   set_allow_tcp_listen(false);
   const base::CommandLine* cmd_line = base::CommandLine::ForCurrentProcess();
   bool enable_webrtc_stun_origin =
       cmd_line->HasSwitch(switches::kEnableWebRtcStunOrigin);
   if (enable_webrtc_stun_origin) {
     set_origin(origin.spec());
   }
 }
 
@@ skipping 51 matching lines @@
                                  config.relays[i].port),
         protocol,
         config.relays[i].secure));
     relay_server.credentials = credentials;
     port_config->AddRelay(relay_server);
   }
   ConfigReady(port_config);
 }
 
 }  // namespace content