imported/w3c/web-platform-tests/webaudio/the-audio-api/the-channelmergernode-interface/active-processing.https.html

Flaky failing in all GStreamer platforms, more frequently on release builds, since the crashes around r26836x and r26835x were fixed.

Testing locally, I've got 7 failures out of 200 runs.

Diff:

--- /home/buildbot/worker/gtk-linux-64-release-tests/build/layout-test-results/imported/w3c/web-platform-tests/webaudio/the-audio-api/the-channelmergernode-interface/active-processing.https-expected.txt
+++ /home/buildbot/worker/gtk-linux-64-release-tests/build/layout-test-results/imported/w3c/web-platform-tests/webaudio/the-audio-api/the-channelmergernode-interface/active-processing.https-actual.txt
@@ -1,15 +1,14 @@
+
+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 7.
 FAIL X Test 1: Number of convolver output channels is not equal to 1. Got 0. assert_true: expected true got false
-PASS   Number of distinct values is equal to 2.
-FAIL < [test] 1 out of 3 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
 

This error may be related to bug212959, with same sterr output about failing to load about:blank in some runs.