Unified screen preview section (2/3). am: 2fe5f2def3

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/ThemePicker/+/20816872

Change-Id: I1a0bca3fc5117314d46704e719865b1741a87bcb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>