Add WPT coverage of Sec-CH-Width with lazy auto sizes
This patch adds WPT coverage of Sec-CH-Width with lazy auto sizes:
https://html.spec.whatwg.org/#sizes-attributes
https://wicg.github.io/responsive-image-client-hints/#sec-ch-width
Bug: 335630145
Change-Id: I9b76c7049f5775a3a656f3feec70712fc7da9e4a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5531414
Reviewed-by: Traian Captan tcaptan@chromium.org
Commit-Queue: Philip Rogers pdr@chromium.org
Cr-Commit-Position: refs/heads/main@{#1302666}