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Manual tests run:
- Tab traverse forwards
- Tab traverse backwards
- ChromeVox traverse forwards
- ChromeVox traverse backwards
- Click inside non-navigable card
- Tap inside non-navigable card
- Click inside navigable card
- Tap inside navigable card
- Tab traverse multiple cards

Bug: b:146351046
Change-Id: I72bb661765792ec0d222c39dd82df3f0795d6d81
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2003219Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Commit-Queue: David Black <dmblack@google.com>
Cr-Commit-Position: refs/heads/master@{#732583}