Set background color for focused summary in the Layout panel
Set background color for focused summary in the Layout panel

Screenshot: https://i.imgur.com/A7IA9yt.png

Fixed: 1135449
Change-Id: I8ca66869a8be638f3ca09e4b3fcfac48a051388d
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2526682
Reviewed-by: Changhao Han <68542faf32f0a558a873c0f094ca9bedb2744bff@chromium.org>
Commit-Queue: Alex Rudenko <d8d88e7d7e77f69e23d1d1432231196fb8e02a62@chromium.org>

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