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The window selector gets names from Aura windows. Propagate titles from
app names to the aura window titles, as the web content itself may not
have a title.

This is split out from the CL to test all widgets and views for
nameless focusable objects. See crrev.com/c/951933.

Bug: 819350
Change-Id: Id61d9398824b836a644c57813f1521faf1aae70f
Reviewed-on: https://chromium-review.googlesource.com/961093Reviewed-by: Trent Apted <tapted@chromium.org>
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543063}