Add av1 to video-encoder-flush WPT

Differential Revision: https://phabricator.services.mozilla.com/D210065

bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1895635
gecko-commit: 508643593dcebfcbfa6d42c4866116bd9a2f2b0f
gecko-reviewers: media-playback-reviewers, padenot

webcodecs/video-encoder-flush.https.any.js

@@ -2,32 +2,22 @@
 // META: script=/common/media.js
 // META: script=/webcodecs/utils.js
 // META: script=/webcodecs/video-encoder-utils.js
+// META: variant=?av1
 // META: variant=?vp8
 // META: variant=?h264_avc
 
-const VP8_CONFIG = {
-  codec: 'vp8',
-  width: 640,
-  height: 480,
-  displayWidth: 800,
-  displayHeight: 600,
-};
-
-const H264_AVC_CONFIG = {
-  codec: 'avc1.42001e', // Baseline
-  width: 640,
-  height: 480,
-  displayWidth: 800,
-  displayHeight: 600,
-  avc: {format: 'avc'},
-};
-
 let CONFIG = null;
 promise_setup(async () => {
-  CONFIG = {
-    '?vp8': VP8_CONFIG,
-    '?h264_avc': H264_AVC_CONFIG,
+  const config = {
+    '?av1': {codec: 'av01.0.04M.08'},
+    '?vp8': {codec: 'vp8'},
+    '?h264_avc': {codec: 'avc1.42001e', avc: {format: 'avc'}},
   }[location.search];
+  config.width = 640;
+  config.height = 480;
+  config.displayWidth = 800;
+  config.displayHeight = 600;
+  CONFIG = config;
 });
 
 promise_test(async t => {