Add flags for GSF on Bouncer & QS

These flags are for the first round of implementation of GSF styles on
Bouncer and Quick Settings. These flags will be removed once we gather
the trunkfood-50 metrics.

Flag: EXEMPT adding new flags
Bug: 379364381
Test: N/A
Change-Id: Ib8459d61ce002e198aa37383d777348dfacd4051