[ iOS ] imported/w3c/web-platform-tests/content-security-policy/frame-ancestors/frame-ancestors-from-serviceworker.https.html is a flaky failure

[Truitt Savell]

imported/w3c/web-platform-tests/content-security-policy/frame-ancestors/frame-ancestors-from-serviceworker.https.html

This test is flaking on iOS. History shows that around r255423 this test changed from a flaky crash to a flaky failure. I am unsure if this should be considered a regression or not. 

History:
https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fcontent-security-policy%2Fframe-ancestors%2Fframe-ancestors-from-serviceworker.https.html

Diff:
--- /Volumes/Data/slave/ios-simulator-13-release-tests-wk2/build/layout-test-results/imported/w3c/web-platform-tests/content-security-policy/frame-ancestors/frame-ancestors-from-serviceworker.https-expected.txt
+++ /Volumes/Data/slave/ios-simulator-13-release-tests-wk2/build/layout-test-results/imported/w3c/web-platform-tests/content-security-policy/frame-ancestors/frame-ancestors-from-serviceworker.https-actual.txt
@@ -1,4 +1,5 @@
 
+Harness Error (TIMEOUT), message = null
 
-PASS A 'frame-ancestors' CSP directive set from a serviceworker response with a value 'none' should block rendering. 
+NOTRUN A 'frame-ancestors' CSP directive set from a serviceworker response with a value 'none' should block rendering.

[Radar WebKit Bug Importer]

<rdar://problem/59354603>

[Truitt Savell]

This test was last synced in https://trac.webkit.org/changeset/254133/webkit which doesn't line up with when this test went from crashing to failing.

[Truitt Savell]

This test is not reproducing locally by running the test in iterations.

[Truitt Savell]

Marked this test as failing while it is investigated: https://trac.webkit.org/changeset/256321/webkit