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The USB/Bluetooth device chooser was announcing "No devices available"
even though devices were available. The message also sometimes briefly flashed.

To fix this, wait until data is initialized or initial focus occurs before
showing the message.

This is one part of ongoing work to improve accessibility of this dialog.

Bug: 820351
Change-Id: Ia295b7514725512cf0de539d238402a51e220055
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1970260Reviewed-by: Vincent Scheib <scheib@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Ovidio de Jesús Ruiz-Henríquez <odejesush@chromium.org>
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#728560}