Bug 1685237 [wpt PR 27055] - Implement VideoDecoder.isConfigSupported(), a=testonly

Automatic update from web-platform-tests
Implement VideoDecoder.isConfigSupported()

API and motivations described here:
w3c/webcodecs#98

Spec PR here:
w3c/webcodecs#120

Bug: 1141707
Test: new layout tests
Change-Id: I3e53da5961119b4b36ec76666ad1a67cca19b963
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2612684
Commit-Queue: Chrome Cunningham <chcunninghamchromium.org>
Reviewed-by: Thomas Guilbert <tguilbertchromium.org>
Cr-Commit-Position: refs/heads/master{#841376}

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wpt-commits: e265ce28838b485f20b11aee723486a035715216
wpt-pr: 27055

UltraBlame original commit: 4df452a17a2f953d1ab68743d1fd7c03e3c30a7e

Author: marco-c