[@layer] Cascade VTT-embedded style as element-attached style #31591
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As per w3c/csswg-drafts#6735:
WebVTT-embedded style has the same cascade precedence as the style
attribute. Therefore, important WebVTT-embedded style should take
precedence over important author layered style.
This patch ensures that.
Bug: 1095765
Change-Id: I352ff87294235433bcf006e233a2ca7514d4f990
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3273710
Reviewed-by: Anders Hartvoll Ruud <andruud@chromium.org>
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/main@{#940808}