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Makes wpt tests for css-backgrounds pass.

Bug: 959763
Change-Id: I7baefb3697bdb66ab55baf181abd630b621fc350
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1906406
Commit-Queue: Rune Lillesveen <futhark@chromium.org>
Reviewed-by: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#754883}