Bug 1696983 [wpt PR 27889] - Replace ImageDecoder::canDecodeType() with async isTypeSupported()., a=testonly

Automatic update from web-platform-tests
Replace ImageDecoder::canDecodeType() with async isTypeSupported().

This updates us with the latest planned version of the spec.

R=chcunningham

Bug: 1182435
Test: Updated tests. New WPT tests.
Change-Id: I47a981b26f89f94cf943e0a356202c129f285e94
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2733922
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Cr-Commit-Position: refs/heads/master@{#860145}

--

wpt-commits: e055b8d439d6f4b09635f1f0c3180e17cf368071
wpt-pr: 27889

testing/web-platform/tests/webcodecs/image-decoder.any.js

@@ -85,3 +85,18 @@ promise_test(t => {
 promise_test(t => {
   return testFourColorsDecode('four-colors.gif', 'image/gif');
 }, 'Test GIF image decoding.');
+
+promise_test(t => {
+  return fetch('four-colors.png').then(response => {
+    let decoder = new ImageDecoder({data: response.body, type: 'junk/type'});
+    return promise_rejects_dom(t, 'NotSupportedError', decoder.decode());
+  });
+}, 'Test invalid mime type rejects decode() requests');
+
+promise_test(t => {
+  return fetch('four-colors.png').then(response => {
+    let decoder = new ImageDecoder({data: response.body, type: 'junk/type'});
+    return promise_rejects_dom(
+        t, 'NotSupportedError', decoder.decodeMetadata());
+  });
+}, 'Test invalid mime type rejects decodeMetadata() requests');