Merge "Reduce unnecessary redraw of wallpaper when switching orientation" into udc-dev am: 72d126cd am: c9e99e46 am: 0e279d9a

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23444291



Change-Id: I1e2c214555fecf6fb1e07210a4d33eb95a4e9dd9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>