Merge "Loading animation for landing page screen preview (2/3)" into...

Merge "Loading animation for landing page screen preview (2/3)" into udc-qpr-dev am: 147e1a63 am: 6e752bf2

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/ThemePicker/+/23831371



Change-Id: I437c6c0b37288085cad99eadb5fd0efcac60f429
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>