Add ability for anchored bubbles to not be focus traversable from their anchor views.

Make tab hover cards not focus traversable from their anchoring tabs.

Bug: 963537
Change-Id: I881099b8fb289d15fe29ada24495d737695a5626
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1627214
Commit-Queue: Caroline Rising <corising@chromium.org>
Reviewed-by: Dana Fried <dfried@chromium.org>
Cr-Commit-Position: refs/heads/master@{#662903}
3 files changed