[css-properties-values-api] Add tests for explicit inheritance.

R=futhark@chromium.org

Bug: 641877
Change-Id: I5f12db2690ec02248cb0533b2f18da2613afea98
Reviewed-on: https://chromium-review.googlesource.com/1235723
Commit-Queue: Anders Ruud <andruud@chromium.org>
Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592791}
1 file changed