[automerger skipped] Set up show/hide in startT/finishT for wallpapers am: ece9c0e3 -s ours

am skip reason: Merged-In Ic0524c97f2922437d7ab20fcaa279aa5793ab7ec with SHA-1 0c543465 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/28288502



Change-Id: I561179b96838e58be3694c39d08ee3c17770bb91
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>