AOSP/WallpaperPicker - Updated to sdkVersion 29. am: b2ea6041c4 am: 8537712078 am: 9fce36df32 am: 3252a805b6 am: 890643ffb9 am: 58bc02e4d2 am: 280c75f315

Original change: https://android-review.googlesource.com/c/platform/packages/apps/WallpaperPicker/+/1145288

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I8a1d75a75000c39bcea870604bae3ac692c2874f