Support a user-provided string for the TLS ALPN extension.

webrtc/p2p/base/basicpacketsocketfactory.h

 /*
  *  Copyright 2011 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 19 matching lines @@
                                      uint16_t min_port,
                                      uint16_t max_port) override;
   AsyncPacketSocket* CreateServerTcpSocket(const SocketAddress& local_address,
                                            uint16_t min_port,
                                            uint16_t max_port,
                                            int opts) override;
   AsyncPacketSocket* CreateClientTcpSocket(const SocketAddress& local_address,
                                            const SocketAddress& remote_address,
                                            const ProxyInfo& proxy_info,
                                            const std::string& user_agent,
-                                           int opts) override;
+                                           int opts) override {
+    //PacketSocketTcpOptions tcp_options = {.opts = opts};
+    PacketSocketTcpOptions tcp_options;
+    tcp_options.opts = opts;
+    return CreateClientTcpSocket(local_address, remote_address, proxy_info,
+                                 user_agent, tcp_options);
+  }
+  AsyncPacketSocket* CreateClientTcpSocket(
+      const SocketAddress& local_address,
+      const SocketAddress& remote_address,
+      const ProxyInfo& proxy_info,
+      const std::string& user_agent,
+      const PacketSocketTcpOptions& tcp_options) override;
 
   AsyncResolverInterface* CreateAsyncResolver() override;
 
  private:
   int BindSocket(AsyncSocket* socket,
                  const SocketAddress& local_address,
                  uint16_t min_port,
                  uint16_t max_port);
 
   SocketFactory* socket_factory();
 
   Thread* thread_;
   SocketFactory* socket_factory_;
 };
 
 }  // namespace rtc
 
 #endif  // WEBRTC_P2P_BASE_BASICPACKETSOCKETFACTORY_H_