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Adding role="application" lets us be in control of the mode change on windows for screen readers.
aria-roledescription is necessary now because we don't want to change users' expectations that this is a menu.

Focus target change is necessary because focusing the application causes all its contents to be read as a label.

Bug: 855123
Change-Id: If2428d875f325b55339b6ad3c14874c9e066e584
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1869483Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Dan Beam <dbeam@chromium.org>
Commit-Queue: Hector Carmona <hcarmona@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710034}