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This fixes a regression where accelerators like Ctrl+T would not work
after changing the keyboard layout after [1].  XKB internally selects
and handles NewKeyboardNotify events, which get fired when changing
the keyboard layout.  This CL fixes the issue by manually selecting
and responding to these events.

[1] https://chromium-review.googlesource.com/c/chromium/src/+/2317767

R=sky
CC=nickdiego

Bug: 1125886
Change-Id: Ie8b84e1947da2deb527cd572f7a646b4f833b3ed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2402301
Auto-Submit: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805586}