REGRESSION (r228901): Layout Test http/tests/appcache/abort-cache-onprogress.html is a flaky failure

[Ryan Haddad]

The following layout test is flaky on iOS and macOS WK2

http/tests/appcache/abort-cache-onprogress.html

Probable cause:

This seems to have regressed with https://trac.webkit.org/changeset/228901/webkit

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=http%2Ftests%2Fappcache%2Fabort-cache-onprogress.html

--- /Volumes/Data/slave/sierra-debug-tests-wk2/build/layout-test-results/http/tests/appcache/abort-cache-onprogress-expected.txt
+++ /Volumes/Data/slave/sierra-debug-tests-wk2/build/layout-test-results/http/tests/appcache/abort-cache-onprogress-actual.txt
@@ -1,4 +1,3 @@
 CONSOLE MESSAGE: line 1: ApplicationCache is deprecated. Please use ServiceWorkers instead.
-CONSOLE MESSAGE: line 15: Application Cache download process was aborted.
 This tests that download process was aborted after progress event.
-loading resource: 0 / 4 loading resource: 1 / 4 loading resource: 2 / 4 loading resource: 3 / 4 SUCCESS
+loading resource: 0 / 4 loading resource: 1 / 4 loading resource: 2 / 4 loading resource: 3 / 4 loading resource: 4 / 4 FAILURE CACHED

[youenn fablet]

All these app cache tests are unfortunately flaky. We should change them to make them less flaky.

[Ryan Haddad]

Marked test as flaky in https://trac.webkit.org/changeset/229780/webkit

[Jason Lawrence]

Created attachment 389837 [details]
Update Test Expectations

[Truitt Savell]

Comment on attachment 389837 [details]
Update Test Expectations

Clearing flags on attachment: 389837

Committed r255840: <https://trac.webkit.org/changeset/255840>