Bug 1690596 [wpt PR 27460] - Infer img's aspect ratio from <source>'s width/height...

Bug 1690596 [wpt PR 27460] - Infer img's aspect ratio from <source>'s width/height attrs, a=testonly

Automatic update from web-platform-tests
Infer img's aspect ratio from <source>'s width/height attrs

Intent to ship:
https://groups.google.com/a/chromium.org/g/blink-dev/c/GEjjJE0LCnM/m/0p8CJ48hAgAJ

Spec:
https://github.com/whatwg/html/pull/5894/files

Fixed: 1137794
Change-Id: Idf82ad001a3de4db7204fcd6aec1c7138e5982fa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2642939
Commit-Queue: Christian Biesinger <cbiesinger@chromium.org>
Auto-Submit: Christian Biesinger <cbiesinger@chromium.org>
Reviewed-by: Yoav Weiss <yoavweiss@chromium.org>
Reviewed-by: Mason Freed <masonfreed@chromium.org>
Reviewed-by: Ian Kilpatrick <ikilpatrick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#857317}

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wpt-commits: 2f27da8fda37f5d96b9e5a17bb394494ee5fc98b
wpt-pr: 27460