[Autofill Assistant] Add carousel chips in model.

Change-Id: I9b12db58728f9e18b54dc270d300005219ea2d77
Reviewed-on: https://chromium-review.googlesource.com/c/1426780
Commit-Queue: Jordan Demeulenaere <jdemeulenaere@chromium.org>
Reviewed-by: Stephane Zermatten <szermatt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#625171}
13 files changed