[css-properties-values-api] Test that interpolated values reach worklet.

R=ikilpatrick@chromium.org

Bug: 641877
Change-Id: Ic0403289f9deaf97369962d6901bafb58dc46931
Reviewed-on: https://chromium-review.googlesource.com/c/1283018
Reviewed-by: Ian Kilpatrick <ikilpatrick@chromium.org>
Commit-Queue: Anders Ruud <andruud@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600698}
11 files changed