Reapply "Support @contents in mixins." #54148
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This reverts commit 043e18fb9af4b93e26460f809d27970ddfba5d76.
Original change's description:
Change-Id: I9d288901c7980b6dcb710bd9c27405de37adf656
Reviewed-on: https://chromium-review.googlesource.com/6821572
WPT-Export-Revision: f5d76e8b0c8080ac4985b8efb1a7cf256ee8690c