Layout Test http/wpt/mediarecorder/MediaRecorder-AV-audio-video-dataavailable.html is a flaky failure

[Ryan Haddad]

The following layout test is flaky on macOS

http/wpt/mediarecorder/MediaRecorder-AV-audio-video-dataavailable.html

Probable cause:

Unknown, this test has been flaky for a while and the regression point can not be determined by looking at the dashboard.

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=http%2Fwpt%2Fmediarecorder%2FMediaRecorder-AV-audio-video-dataavailable.html

--- /Volumes/Data/slave/mojave-leaks/build/layout-test-results/http/wpt/mediarecorder/MediaRecorder-AV-audio-video-dataavailable-expected.txt
+++ /Volumes/Data/slave/mojave-leaks/build/layout-test-results/http/wpt/mediarecorder/MediaRecorder-AV-audio-video-dataavailable-actual.txt
@@ -1,4 +1,7 @@
+CONSOLE MESSAGE: line 2659: Error: assert_approx_equals: Red channel of the pixel at (25, 25) expected 255 +/- 20 but got 0
 
 
-PASS MediaRecorder can successfully record the video for a audio-video stream 
+Harness Error (FAIL), message = Error: assert_approx_equals: Red channel of the pixel at (25, 25) expected 255 +/- 20 but got 0
 
+TIMEOUT MediaRecorder can successfully record the video for a audio-video stream Test timed out
+

[Radar WebKit Bug Importer]

<rdar://problem/50554421>

[Ryan Haddad]

This is still happening, we should mark the test as flaky.

[Alexey Proskuryakov]

This test is flaky on iOS too, re-titling. Also seeing less frequent timeouts, especially on internal testers.

Added expectations in http://trac.webkit.org/r253891