GitLab

Allows users to focus into and out of the caption bubble using F6,
which rotates focus between focusable panes.

AX-Relnotes: N/A
Bug: 1055150
Change-Id: I82efd54644fbc1cada2cb3e2f5cf4c52da21336a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2197255Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Abigail Klein <abigailbklein@google.com>
Commit-Queue: Katie Dektar <katie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#770294}