[gardening] Mark LibTest/io/FileSystemCreateEvent/isDirectory_A01_t06 flaky

The test makes assumptions about file system events firing synchronously with file system operations

Issue https://github.com/dart-lang/co19/issues/186

Change-Id: Ic54782662e453c240d92113d25f7a6897b268130
Reviewed-on: https://dart-review.googlesource.com/c/85684
Reviewed-by: Daco Harkes <dacoharkes@google.com>
Commit-Queue: Daco Harkes <dacoharkes@google.com>
Auto-Submit: Daco Harkes <dacoharkes@google.com>
diff --git a/tests/co19_2/co19_2-kernel.status b/tests/co19_2/co19_2-kernel.status
index e310aef..1e73116 100644
--- a/tests/co19_2/co19_2-kernel.status
+++ b/tests/co19_2/co19_2-kernel.status
@@ -6,6 +6,7 @@
 LibTest/collection/ListBase/ListBase_class_A01_t02: Pass, Slow  # Does many calls
 LibTest/collection/ListMixin/ListMixin_class_A01_t02: Pass, Slow  # Does many calls
 LibTest/core/List/List_class_A01_t02: Pass, Slow  # Does many calls
+LibTest/io/FileSystemCreateEvent/isDirectory_A01_t06: Pass, RuntimeError # https://github.com/dart-lang/co19/issues/186
 LibTest/io/RawDatagramSocket/close_A01_t01: Pass, RuntimeError # https://github.com/dart-lang/co19/issues/195
 LibTest/io/RawDatagramSocket/singleWhere_A03_t01: Pass, RuntimeError # https://github.com/dart-lang/co19/issues/195