Doris Ling 6f60cddc9e Add a new feature flag for the expand button in support lib.
- check the feature flag to determine whether to use the existing
progressive disclosure mixin or use the expand button in the support
library.
- add corresponding preference xml files that add the new preference
group attribute to use with the expand button in the support lib.

Bug: 63985174
Test: make RunSettingsRoboTests
Change-Id: Ida6eb6182a8066ad1413b7f6142512345fd914d0
2017-09-15 11:56:31 -07:00
2017-05-31 15:24:25 -07:00
2015-04-13 09:21:39 -07:00
2017-09-12 13:10:08 -07:00
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3.1 GiB
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