Merge "Execute flicker tests with device without wallpaper" into tm-dev am: 759d7606 am: da2bb131 am: 4136f92c

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17745135



Change-Id: I7c6af2d9013bb9a5cf0bf5083d4542eb89901444
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>