webcodecs: WPT test for unsupported formats in VF.allocationSize()

Bug: 40267195
Change-Id: I8178bea9a753e0cc1a2c0092760ec468ed04999f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5530313
Commit-Queue: Eugene Zemtsov <eugene@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1298991}

webcodecs/videoFrame-copyTo-rgb.any.js

@@ -243,6 +243,8 @@ function test_unsupported_pixel_formats() {
       const data = new Uint32Array(16);
       const options = {format: pixelFormat};
       const frame = new VideoFrame(data, init);
+      assert_throws_dom(
+        'NotSupportedError', () => frame.allocationSize(options));
       await promise_rejects_dom(
           t, 'NotSupportedError', frame.copyTo(data, options))
       frame.close();