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When a user clicks on a character in the braille caption panel, it
sends a routing event to the braille command listener and moves
the cursor to the designated position.

Chromevox. Click on a character in the panel to move the cursor to the
desired position.

AX-Relnotes: Added cursor routing to the braille caption panel in
Change-Id: I28e10e17f81c9b0336842a2756263c9f5acb8df2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2333752Reviewed-by: David Tseng <dtseng@chromium.org>
Commit-Queue: Abigail Klein <abigailbklein@google.com>
Cr-Commit-Position: refs/heads/master@{#795933}