Add insets for TrayBackgroundView focus ring

This will ensure the focus ring is visible with it's full
thickness.

Bug: 1015348
Change-Id: I8d618d3b39b7a4cb48e709eb541f70c10a71573f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1947641
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Ahmed Mehfooz <amehfooz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721173}
1 file changed