Bug 1762620 - Add a test with a wav file that has 255 audio channels. r=alwu

Differential Revision: https://phabricator.services.mozilla.com/D143624

dom/media/test/crashtests/1762620.html

@@ -0,0 +1,8 @@
+<audio id='fuzzed' controls>
+  <source src='fuzzed.wav'>
+</audio>
+<script>
+  var m = document.getElementById('fuzzed')
+  m.addEventListener('canplay', m.play, true)
+</script>
+

dom/media/test/crashtests/crashtests.list

@@ -152,4 +152,5 @@ load 1734008.html
 load 1741677.html
 load 1748272.html
 load 1752917.html
+load 1762620.html
 load 1765842.html