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Previously opening holding space via keyboard would keep focus on the
holding space tray and not be able to enter the holding space bubble.

Also, we weren't previously watching for destruction of the holding
space bubble widget so if it was closed without going through
HoldingSpaceTray::CloseBubble(), we got in a bad state. This could
happen if the user closed holding space via the ESC key. This has now
been fixed.

Bug: 1131261
Change-Id: Iad72a25e3798192c111bbdb929b4c70f22dd2c46
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2432678Reviewed-by: Ahmed Mehfooz <amehfooz@chromium.org>
Commit-Queue: David Black <dmblack@google.com>
Cr-Commit-Position: refs/heads/master@{#810901}