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This CL keeps the user email shown also if parent container is focused
or hovered. It introduces a notification from the container towards the
avatar button when the highlight state changes.

In a follow-up CL the same notification will also be used to hide the
border of the button.

Bug: 967317
Change-Id: I80866957d7098c675ad20d7fd03d1f45ad5aeec9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1826678
Commit-Queue: Jan Krcal <jkrcal@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704595}