Bug 1822876: Add H3 ECH Telemetry. r=kershaw,necko-reviewers
This patch adds telemetry which records when H3 connections succeed / fail
and what kind of ECH they used. Our H3 ECH tests are extended to test these
different modes and that the telemetry is recorded correctly.
Differential Revision:
https://phabricator.services.mozilla.com/D172813
<!DOCTYPE HTML>
<html>
<head>
<title>Tell the cycle collector about the audio contexts owned by nsGlobalWindow</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<script type="text/javascript" src="webaudio.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
</head>
<body>
<pre id="test">
<script class="testbody" type="text/javascript">
var iframe = document.createElementNS("http://www.w3.org/1999/xhtml", "iframe");
document.body.appendChild(iframe);
var frameWin = iframe.contentWindow;
new frameWin.AudioContext();
document.body.removeChild(iframe);
expectException(() => new frameWin.AudioContext(),
DOMException.INVALID_STATE_ERR);
// This test should not leak.
</script>
</pre>
</body>
</html>
