[Gecko Bug 1582407] Fix MediaRecorder-pause-resume.html to avoid start() ambiguities. #19502
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The spec allows for MediaRecorder.start() to hold the "start" event until it
has collected some actual data. This means "pause" and "resume" events can occur
before "start", on the contrary of this testcase.
This patch avoids this ambiguity by:
Note that without 1), 2) could wait indefinitely, resulting in a timeout.
Differential Revision: https://phabricator.services.mozilla.com/D46470
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1582407
gecko-commit: d7ab956c296257c99630aa0d4e91d41434c55137
gecko-integration-branch: autoland
gecko-reviewers: jib