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For very mysterious reasons, this only kind of works; peeking at the
systemwide notification which is sent (UAZoomFocusDidChangeNotification),
something often tells the system to go focus a seemingly random part of the
screen instead.

I've been unable to make headway on this, so sending CL on the principle
that "something is better than nothing." We can revisit later if we can
figure out why this is happening.

Comfortingly (?) the same thing happens to Safari web content so I'm going
to assume something is wonky with this system on the OS side.

Bug: 957395
Change-Id: I8356cff86795f19648ab6746d1f23fd5ea1a7025
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1713390Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Leonard Grey <lgrey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682303}