Collect all ConnectionAttempts from both sockets in TransportConnectJob.

net/socket/unix_domain_client_socket_posix.h

Index: net/socket/unix_domain_client_socket_posix.h
diff --git a/net/socket/unix_domain_client_socket_posix.h b/net/socket/unix_domain_client_socket_posix.h
index 0ddb9d9558fb59fa3fe9c88a3302f9c9229c04a2..77ef9d579446078a7eea4335c979b40b7b823ad4 100644
--- a/net/socket/unix_domain_client_socket_posix.h
+++ b/net/socket/unix_domain_client_socket_posix.h
@@ -55,6 +55,9 @@ class NET_EXPORT UnixDomainClientSocket : public StreamSocket {
   bool WasNpnNegotiated() const override;
   NextProto GetNegotiatedProtocol() const override;
   bool GetSSLInfo(SSLInfo* ssl_info) override;
+  void GetConnectionAttempts(ConnectionAttempts* out) const override;
+  void ClearConnectionAttempts() override {}
+  void AddConnectionAttempts(const ConnectionAttempts& attempts) override {}
 
   // Socket implementation.
   int Read(IOBuffer* buf,