CSS Add support for ::part to SelectorChecker.

Bug: 805271
Change-Id: I839abbb345aecaf675b762780700f882b3635c2e
Reviewed-on: https://chromium-review.googlesource.com/972772
Commit-Queue: Fergal Daly <fergal@chromium.org>
Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545803}
1 file changed