Update from https://crrev.com/312600

mojo/services/network/public/cpp/udp_socket_wrapper.h

 // Copyright 2014 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 MOJO_SERVICES_NETWORK_PUBLIC_CPP_UDP_SOCKET_WRAPPER_H_
 #define MOJO_SERVICES_NETWORK_PUBLIC_CPP_UDP_SOCKET_WRAPPER_H_
 
 #include <queue>
 
 #include "network/public/interfaces/udp_socket.mojom.h"
@@ skipping 25 matching lines @@
                    uint32_t receive_queue_slots,
                    uint32_t requested_max_pending_sends);
 
   ~UDPSocketWrapper() override;
 
   void AllowAddressReuse(const ErrorCallback& callback);
 
   void Bind(NetAddressPtr addr,
             const Callback<void(NetworkErrorPtr, NetAddressPtr)>& callback);
 
+  void Connect(NetAddressPtr remote_addr,
+               const Callback<void(NetworkErrorPtr, NetAddressPtr)>& callback);
+
   void SetSendBufferSize(uint32_t size, const ErrorCallback& callback);
 
   void SetReceiveBufferSize(uint32_t size, const ErrorCallback& callback);
 
   // If there are already incoming datagrams cached locally, this method runs
   // |callback| before it returns, and the return value is set to true.
   // Otherwise, the return value is set to false and the callback will be run
   // asynchronously.
+  // If the socket is connected, the net address pointer passed into the
+  // callback is set to null.
   bool ReceiveFrom(const ReceiveCallback& callback);
 
   // This method is aware of the max pending send requests allowed by the
   // service, and caches send requests locally if necessary.
+  // |dest_addr| is allowed to be null if the socket is connected.
   void SendTo(NetAddressPtr dest_addr,
               Array<uint8_t> data,
               const ErrorCallback& callback);
 
  private:
   class NegotiateCallbackHandler : public Callback<void(uint32_t)>::Runnable {
    public:
     explicit NegotiateCallbackHandler(UDPSocketWrapper* delegate);
     ~NegotiateCallbackHandler() override;
 
@@ skipping 68 matching lines @@
   uint32_t max_pending_sends_;
   uint32_t current_pending_sends_;
 
   // Owns all the objects that its elements point to.
   std::queue<SendRequest*> send_requests_;
 };
 
 }  // namespace mojo
 
 #endif  // MOJO_SERVICES_NETWORK_PUBLIC_CPP_UDP_SOCKET_WRAPPER_H_