Grid:Top story slice layout

Build 10381 on yarn-v2-upgrade
Reviewing disabled
Baseline History
Build 103818dc8ac2 current baseline
Current build. Accepted by Harvey Peachey.
Build 103802d30653
Inherited baseline identical to build 10362
Build 10362e37cb44
Accepted by Harry Verhoef.
Build 103324f98e69
Accepted by Harry Verhoef.
Build 10317332d17e
Accepted by Harry Verhoef.
Build 10236b8809b9
Accepted by Rebecca McGinn.
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