Picker:Clearable Themes

Build 3602 on feat-migration-to-okhsl
Reviewing disabled
Baseline History
Build 36021874666
Current build. There are unaccepted changes, so build 3591 is still the baseline.
Build 3591127553a current baseline
Accepted by Andrey Yamanov.
Build 3464219a704
Accepted by Andrey Yamanov.
Build 3442e2aff73
Auto-accepted
Commenting is disabled because there's a newer build on this branch