Merge "Move ImageWallpaper tasks to its own thread" into tm-qpr-dev am: 1467c855 am: 25ab8b37

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20982123



Change-Id: I2275d05910dd7905696589be18321cb04726554b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>