Bug 187911

The following layout test is flaky on macOS debug bots imported/w3c/web-platform-tests/media-source/SourceBuffer-abort-readyState.html Probable cause: Unknown, this test has been flaky for a while. Flakiness Dashboard: https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=imported%2Fw3c%2Fweb-platform-tests%2Fmedia-source%2FSourceBuffer-abort-readyState.html The test usually completes less than 2 seconds, but intermittently times out after 135 seconds with the following diff: --- /Volumes/Data/slave/sierra-debug-tests-wk2/build/layout-test-results/imported/w3c/web-platform-tests/media-source/SourceBuffer-abort-readyState-expected.txt +++ /Volumes/Data/slave/sierra-debug-tests-wk2/build/layout-test-results/imported/w3c/web-platform-tests/media-source/SourceBuffer-abort-readyState-actual.txt @@ -1,4 +1,7 @@ +CONSOLE MESSAGE: line 51: InvalidStateError: The object is in an invalid state. + +Harness Error (FAIL), message = InvalidStateError: The object is in an invalid state. FAIL SourceBuffer#abort() (video/webm; codecs="vorbis,vp8") : If the readyState attribute of the parent media source is not in the "open" state then throw an INVALID_STATE_ERR exception and abort these steps. assert_unreached: Browser doesn't support the MIME used in this test: video/webm; codecs="vorbis,vp8" Reached unreachable code -PASS SourceBuffer#abort() (video/mp4) : If the readyState attribute of the parent media source is not in the "open" state then throw an INVALID_STATE_ERR exception and abort these steps. +TIMEOUT SourceBuffer#abort() (video/mp4) : If the readyState attribute of the parent media source is not in the "open" state then throw an INVALID_STATE_ERR exception and abort these steps. Test timed out