Update co19 status and timing-out tests.

tests/lib/lib.status

Index: tests/lib/lib.status
diff --git a/tests/lib/lib.status b/tests/lib/lib.status
index 9a2068fa037777064cd620f8efa82167f9e27783..03de7791a0baab00601b28bc80e35634ef580f79 100644
--- a/tests/lib/lib.status
+++ b/tests/lib/lib.status
@@ -208,9 +208,11 @@ mirrors/mirrors_used_get_name2_test: RuntimeError
 convert/streamed_conversion_utf8_decode_test: Pass, Slow  # Issue 12029
 mirrors/mirrors_reader_test: Timeout, Slow, RuntimeError # Issue 16589
 
-[ $runtime == chrome || $runtime == ff]
-convert/streamed_conversion_utf8_encode_test: Pass, Slow, Timeout # Issue 12029
-async/slow_consumer2_test: Pass, Timeout # Please triage this issue.
+[ $runtime == chrome || $runtime == ff || $runtime == ContentShellOnAndroid ]
+convert/streamed_conversion_utf8_encode_test: Skip # Times out. Issue 22050
+convert/streamed_conversion_json_utf8_encode_test: Skip # Times out. Issue 22050
+async/slow_consumer2_test: Skip # Times out. Issue 22050
+async/stream_timeout_test: Skip # Times out. Issue 22050
 
 [ $compiler == dart2js ]
 typed_data/typed_data_hierarchy_int64_test: RuntimeError # Issue 10275