Ag Grid Theme:Column Group

Build 16305 on ag-grid-next-v31
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Build 163051614a1d
Current build. There are unaccepted changes, so build 15865 is still the baseline.
Build 158076a25e64
Accepted by Zhihao Cui.
Commenting is disabled because there's a newer build on this branch. Go to Build 16376 now
Zhihao Cui
4mo ago on build 16305

Header checkbox is an ag grid feature change