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This CL shows a border around toolbar buttons that have non-empty
labels (with a nice fade-in / fade-out while animating the label).

This is only enabled when the avatar animation feature is enabled.

Bug: 967317
Change-Id: I06668d3548f83d9e646d5f52eb995fb93875a55f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1771405
Commit-Queue: Peter Boström <pbos@chromium.org>
Auto-Submit: Jan Krcal <jkrcal@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698700}