markwei 61375f7e97 Implement ChipGroup selection exclusivity.
New singleSelection attribute to control whether the ChipGroup has a multiple-exclusion scope for its chips.
When set to true, the ChipGroup acts as a RadioGroup.

ChipGroup can be used purely for layout purposes when singleSelection is set to false.

PiperOrigin-RevId: 178466966
2018-01-11 10:55:26 -05:00
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