Bug 218321

The test imported/w3c/web-platform-tests/webaudio/the-audio-api/the-convolvernode-interface/active-processing.https.html is flaky on GTK and on WPE

The flakiness is related to random timeouts. When it fails it generates a text failure with an internal timeout:

--- a/imported/w3c/web-platform-tests/webaudio/the-audio-api/the-convolvernode-interface/active-processing.https-expected.txt	2020-10-15 19:37:14.979890994 +0200
+++ b/imported/w3c/web-platform-tests/webaudio/the-audio-api/the-convolvernode-interface/active-processing.https-expected.txt	2020-10-29 03:40:16.406987604 +0100
@@ -1,14 +1,13 @@
 
+Harness Error (TIMEOUT), message = null
+
 PASS # AUDIT TASK RUNNER STARTED.
 PASS Executing "initialize"
-PASS Executing "test"
-PASS Audit report
+TIMEOUT Executing "test" Test timed out
+NOTRUN Audit report
 PASS > [initialize]
 PASS   AudioWorklet module loading resolved correctly.
 PASS < [initialize] All assertions passed. (total 1 assertions)
 PASS > [test]
 PASS   Test 0: Number of convolver output channels is equal to 2.
-FAIL X Number of distinct values is not equal to 2. Got 1. assert_true: expected true got false
-FAIL < [test] 1 out of 2 assertions were failed. assert_true: expected true got false
-FAIL # AUDIT TASK RUNNER FINISHED: 1 out of 2 tasks were failed. assert_true: expected true got false