Merge "Lock screen long-press to open wallpaper picker." into tm-qpr-dev am: b74f4255

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21062331



Change-Id: I083b2e997bef9dd47ad27535802efcece4cd1657
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>