Adds a method to TCPServerSocket to adopt a socket.

net/socket/tcp_socket_unittest.cc

Index: net/socket/tcp_socket_unittest.cc
diff --git a/net/socket/tcp_socket_unittest.cc b/net/socket/tcp_socket_unittest.cc
index d9da13c660cc5f7910de744af5932ff324f575d0..27b8169736448d8412a6db6fefc92d0991a6bcc7 100644
--- a/net/socket/tcp_socket_unittest.cc
+++ b/net/socket/tcp_socket_unittest.cc
@@ -11,6 +11,7 @@
 #include <string>
 #include <vector>
 
+#include "base/files/file_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/time/time.h"
 #include "net/base/address_list.h"
@@ -21,6 +22,9 @@
 #include "net/base/test_completion_callback.h"
 #include "net/log/net_log_source.h"
 #include "net/socket/socket_performance_watcher.h"
+#if defined(OS_POSIX)
+#include "net/socket/socket_posix.h"
+#endif
 #include "net/socket/tcp_client_socket.h"
 #include "net/test/gtest_util.h"
 #include "testing/gmock/include/gmock/gmock.h"
@@ -226,6 +230,26 @@ TEST_F(TCPSocketTest, AcceptAsync) {
   TestAcceptAsync();
 }
 
+#if defined(OS_POSIX)
+// Test AdoptConnectedSocket() for TCPSocketPosix
+TEST_F(TCPSocketTest, AdoptConnectedSocket) {
+  SocketDescriptor socket_fd =
+      CreatePlatformSocket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
+  ASSERT_GE(socket_fd, 0);
+  ASSERT_TRUE(base::SetNonBlocking(socket_fd));
+  IPEndPoint address(IPAddress::IPv4Localhost(), 0);
+  SockaddrStorage storage;
+  ASSERT_TRUE(address.ToSockAddr(storage.addr, &storage.addr_len));
+  ASSERT_GE(bind(socket_fd, storage.addr, storage.addr_len), 0);
+  ASSERT_GE(listen(socket_fd, kListenBacklog), 0);
+
+  ASSERT_THAT(socket_.AdoptConnectedSocket(socket_fd, IPEndPoint()), IsOk());
+  ASSERT_THAT(socket_.GetLocalAddress(&local_address_), IsOk());
+
+  TestAcceptAsync();
+}
+#endif
+
 #if defined(OS_WIN)
 // Test Accept() for AdoptListenSocket.
 TEST_F(TCPSocketTest, AcceptForAdoptedListenSocket) {