Bug 1754792 [wpt PR 32802] - Fix transition of background color depending on currentc...

Bug 1754792 [wpt PR 32802] - Fix transition of background color depending on currentcolor, a=testonly

Automatic update from web-platform-tests
Fix transition of background color depending on currentcolor

The process for extracting an RGBA color from an interpolable value does
not account for additional color blending operations such as current
color. To fix, we add a check that the value represents a simple RGBA
color prior to extracting its value and give up otherwise, which
triggers a fallback to the main thread.

Bug: 1290371
Change-Id: I7cadb7961e198528d3d43bf987cb0909aa765440
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3450601
Reviewed-by: Philip Rogers <pdr@chromium.org>
Reviewed-by: Robert Flack <flackr@chromium.org>
Commit-Queue: Kevin Ellis <kevers@chromium.org>
Cr-Commit-Position: refs/heads/main@{#970068}

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wpt-commits: fec5e6ffebff555362a861ca8221911c7dcaf7fb
wpt-pr: 32802