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Also update users of FocusRowBehavior to set the index in order to take
advantage of the new attributes.

Bug: 1020305
Change-Id: Ife51f853060b5d8e67984f34f7333ec9f7c0345a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1894324
Commit-Queue: Hector Carmona <hcarmona@chromium.org>
Reviewed-by: Dan Beam <dbeam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712227}