Snapshot isolated storage feature flag at boot.

The currently requested feature flag value may lag behind what's
actually active for the current boot, so take a snapshot of the value
that's being used for the current boot.

Bug: 121195267
Test: manual
Change-Id: I969f1d9d385e7610b366df41d2c7728a596d114c
(cherry picked from commit 342b4bf3c7bba2ab56d62959d2df20286605818b)
2 files changed