Add a Preference to allow WebRTC only bind to "any address" (all 0s)

content/renderer/p2p/port_allocator.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 CONTENT_RENDERER_P2P_PORT_ALLOCATOR_H_
 #define CONTENT_RENDERER_P2P_PORT_ALLOCATOR_H_
 
 #include "third_party/webrtc/p2p/client/basicportallocator.h"
 
 namespace content {
@@ skipping 18 matching lines @@
       std::string transport_type;
       bool secure;
     };
 
     std::set<rtc::SocketAddress> stun_servers;
 
     std::vector<RelayServerConfig> relays;
 
     // Disable TCP-based transport when set to true.
     bool disable_tcp_transport;
+
+    // Disable binding to individual NICs when set to false.
+    bool enable_multiple_routes;
   };
 
   P2PPortAllocator(P2PSocketDispatcher* socket_dispatcher,
                    rtc::NetworkManager* network_manager,
                    rtc::PacketSocketFactory* socket_factory,
                    const Config& config);
   ~P2PPortAllocator() override;
 
   cricket::PortAllocatorSession* CreateSessionInternal(
       const std::string& content_name,
@@ skipping 26 matching lines @@
 
  private:
   P2PPortAllocator* allocator_;
 
   DISALLOW_COPY_AND_ASSIGN(P2PPortAllocatorSession);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_P2P_PORT_ALLOCATOR_H_