Mark tests that use Timer as failing on dart2js.

tests/isolate/isolate.status

Index: tests/isolate/isolate.status
diff --git a/tests/isolate/isolate.status b/tests/isolate/isolate.status
index edf1b8b8af7c819a78ad00bff0fa20d39a4c1c03..34815f21515f45f4ae69142d7d70170830c1ea0c 100644
--- a/tests/isolate/isolate.status
+++ b/tests/isolate/isolate.status
@@ -39,6 +39,21 @@ compute_this_script_browser_test: Pass
 
 
 [ $compiler == dart2js ]
+count_test: Fail # Timer interface not supported; dartbug.com/7728.
+cross_isolate_message_test: Fail # Timer interface not supported; dartbug.com/7728.
+isolate_complex_messages_test: Fail # Timer interface not supported; dartbug.com/7728.
+mandel_isolate_test: Fail # Timer interface not supported; dartbug.com/7728.
+message2_test: Fail # Timer interface not supported; dartbug.com/7728.
+message_test: Fail # Timer interface not supported; dartbug.com/7728.
+mint_maker_test: Fail # Timer interface not supported; dartbug.com/7728.
+nested_spawn2_test: Fail # Timer interface not supported; dartbug.com/7728.
+nested_spawn_test: Fail # Timer interface not supported; dartbug.com/7728.
+request_reply_test: Fail # Timer interface not supported; dartbug.com/7728.
+spawn_function_custom_class_test: Fail # Timer interface not supported; dartbug.com/7728.
+spawn_function_test: Fail # Timer interface not supported; dartbug.com/7728.
+stream_mangling_test: Fail # Timer interface not supported; dartbug.com/7728.
+unresolved_ports_test: Fail # Timer interface not supported; dartbug.com/7728.
+
 serialization_test: Fail # Tries to access class TestingOnly declared in isolate_patch.dart
 illegal_msg_test: Fail # Issue 6750