The autoplay layout tests are very very flaky.
https://ci.chromium.org/buildbot/chromium.webkit/WebKit%20Linux%20Trusty%20Leak/12699
* http/tests/media/autoplay/document-user-activation-cross-origin-feature-policy-gesture.html
* http/tests/media/autoplay/document-user-activation-feature-policy-alternating.html
* virtual/mojo-loading/http/tests/media/autoplay/document-user-activation-cross-origin-feature-policy-delegation.html
https://ci.chromium.org/buildbot/chromium.webkit/WebKit%20Linux%20Trusty/36589
* virtual/mojo-loading/http/tests/media/autoplay/document-user-activation-cross-origin-feature-policy-delegation.html
* virtual/mojo-loading/http/tests/media/autoplay/document-user-activation-cross-origin-feature-policy-gesture.html
Comment 1 by a...@chromium.org
, Nov 30 2017