Mark some tests as being timing dependent or slow on hot reload bots

tests/standalone/standalone.status

 # Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # WARNING:
 # Tests using the multitest feature where failure is expected should *also* be
 # listed in tests/lib/analyzer/analyze_tests.status without the "standalone"
 # prefix.
 
 packages_file_test: Skip # Issue 26715
@@ skipping 325 matching lines @@
 io/raw_secure_socket_test: RuntimeError
 io/https_bad_certificate_test: RuntimeError
 io/secure_server_closing_test: RuntimeError
 
 [ $runtime == vm || $runtime == dart_app || $runtime == dart_precompiled ]
 deferred_transitive_import_error_test: Skip # Contains intentional errors.
 
 [ $hot_reload || $hot_reload_rollback ]
 deferred_transitive_import_error_test: Crash # Uses deferred imports.
 package/*: SkipByDesign # Launches VMs in interesting ways.
+io/raw_datagram_read_all_test: Pass, Fail # Timing dependent.
+io/test_runner_test: Pass, Slow # Slow.
+io/skipping_dart2js_compilations_test: Pass, Slow # Slow.
 
 [ $builder_tag == no_ipv6 ]
 io/http_bind_test: Skip
 io/raw_datagram_socket_test: Skip
 io/socket_source_address_test: Skip
 io/socket_bind_test: Skip
 io/http_proxy_advanced_test: Skip
 io/http_ipv6_test: Skip
 io/socket_ipv6_test: Skip