Merge "Adding content desciption for image preview screen" into udc-dev am: 3de9ddfc5c

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/WallpaperPicker2/+/23480220

Change-Id: If9f671d17cdead5396cc4bca5e8a921f0b48300d
Signed-off-by: Automerger Merge Worker <[email protected]>