Start adding TLS (SSL) sockets to dart:io.

tests/standalone/standalone.status

Index: tests/standalone/standalone.status
diff --git a/tests/standalone/standalone.status b/tests/standalone/standalone.status
index 8e9efbb4807cf7695a429f6681907636188f1ecb..09d440e3945465cd8c8fbd0ae55c809caaab87b7 100644
--- a/tests/standalone/standalone.status
+++ b/tests/standalone/standalone.status
@@ -27,11 +27,13 @@ io/http_basic_test: Pass, Fail     # Issue 3599
 # This test fails with "Too many open files" on the Mac OS buildbot.
 io/socket_many_connections_test: Skip
 io/http_server_handler_test: Skip # Issue 2637
+io/tls_socket_test: Skip  # Issue 3950 - not implemented on Mac OS yet.
 
 [ $runtime == vm && $system == windows]
 io/http_shutdown_test: Skip  # Currently times out on windows
 io/file_system_links_test: Skip  # No links on Windows.
 io/http_connection_header_test: Pass, Fail  # Issue 2959
+io/tls_socket_test: Skip  # Issue 3950 - not implemented on Windows yet.
 
 [ $compiler == none && $runtime == drt ]
 io/*: Skip # Don't run tests using dart:io in the browser