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Focus did not work due to two distinct problems, both of which caused
page-level focus to be absent, which in turn meant that blink-level
focus was suppressed.

- The aura::Window on which focus was attempted does not have an
  OnWindowFocused observer. This change focuses the Window that does.

- Wayland app's aura::Windows are not visible. This change adds a check
  for an ancestor that is an exo window.

Bug: b/156123509
Test: manual on device
Change-Id: Ib4e8a5101bbc28d2b7a0448aff8142c8cffa2a76
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2274201Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Reviewed-by: Albert Chaulk <achaulk@chromium.org>
Commit-Queue: Kevin Schoedel <kpschoedel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#786469}