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Allow tab/shift+tab to navigate through all elements in the UI. Let up/down arrows move focus between read later list items. Let right/left arrows cycle focus between a list item and its buttons. This behavior comes from discussion during a11y office hours.

Still TODO: add dark mode support for buttons and hover/focus states (crbug/1147457).

Bug: 1140166
Change-Id: I3a119e8d940a4307e746c10f3ded7541963f46f7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2527345
Commit-Queue: Caroline Rising <corising@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825964}