Adds a method to TCPServerSocket to adopt a socket.

net/socket/socket_posix.cc

 // 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.
 
 #include "net/socket/socket_posix.h"
 
 #include <errno.h>
 #include <netinet/in.h>
 #include <sys/socket.h>
 #include <utility>
@@ skipping 80 matching lines @@
     int rv = MapSystemError(errno);
     Close();
     return rv;
   }
 
   return OK;
 }
 
 int SocketPosix::AdoptConnectedSocket(SocketDescriptor socket,
                                       const SockaddrStorage& address) {
+  int rv = AdoptUnconnectedSocket(socket);
+  if (rv != OK)
+    return rv;
+
+  SetPeerAddress(address);
+  return OK;
+}
+
+int SocketPosix::AdoptUnconnectedSocket(SocketDescriptor socket) {
   DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK_EQ(kInvalidSocket, socket_fd_);
 
   socket_fd_ = socket;
 
   if (!base::SetNonBlocking(socket_fd_)) {
     int rv = MapSystemError(errno);
     Close();
     return rv;
   }
 
-  SetPeerAddress(address);
   return OK;
 }
 
 SocketDescriptor SocketPosix::ReleaseConnectedSocket() {
   StopWatchingAndCleanUp();
   SocketDescriptor socket_fd = socket_fd_;
   socket_fd_ = kInvalidSocket;
   return socket_fd;
 }
 
@@ skipping 418 matching lines @@
     write_buf_ = NULL;
     write_buf_len_ = 0;
     write_callback_.Reset();
   }
 
   waiting_connect_ = false;
   peer_address_.reset();
 }
 
 }  // namespace net