[test] Skip some flaky layout tests.
[test] Skip some flaky layout tests.

NOTRY=true
TBR=jochen@chromium.org

Review URL: https://codereview.chromium.org/1126433004

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#28204}

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh