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This change adds setters for:
* Accessible role & title on Widget
* Initially focused view on Dialog

At first glance these might appear unrelated, but in fact bubbles use
the presence or absence of an initially focused view to decide what role
they should have.

Bug: 1011446, 1075649
Change-Id: I1ad2b8b333c46c9252cc8d5667a21d6b9b7a0d5f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2218688
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772415}