Bug 1924455 [wpt PR 48591] - [wpt] Fail `VideoTrackGenerator-with-win…

…dow-tracks.https.html` faster, a=testonly

Automatic update from web-platform-tests
[wpt] Fail `VideoTrackGenerator-with-window-tracks.https.html` faster

`VideoTrackGenerator` is not exposed to workers, which currently causes
the test to hang. Surface worker errors to the `promise_test()`s
instead.

Drive-by: always revoke the temporary script URL.

Bug: 40058895
Change-Id: Id0e3830abadecac7c76853235a09b201fdad1af0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5922435
Auto-Submit: Jonathan Lee <[email protected]>
Reviewed-by: Harald Alvestrand <[email protected]>
Commit-Queue: Jonathan Lee <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1368294}

--

wpt-commits: 302e6e04c6c54bf3891e6a6a15a2e04e3f72bb52
wpt-pr: 48591

testing/web-platform/tests/mediacapture-insertable-streams/VideoTrackGenerator-with-window-tracks.https.html

@@ -64,11 +64,15 @@ <h1 class="instructions">Description</h1>
       const blob = new Blob([script], { type: 'text/javascript' });
       const url = URL.createObjectURL(blob);
       const worker = new Worker(url);
-      await new Promise(resolve => worker.onmessage = () => {
-          resolve();
-      });
-      URL.revokeObjectURL(url);
-      return worker;
+      try {
+        await new Promise((resolve, reject) => {
+          worker.onmessage = resolve;
+          worker.onerror = (err) => reject(err.message);
+        });
+        return worker;
+      } finally {
+        URL.revokeObjectURL(url);
+      }
     }
 
    promise_test(async t => {