Merge "Keep showing wallpaper when starting an app immediatly after unlock." into sc-v2-dev am: efcf2e85 am: ef310224 am: 60c042aa

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/16978905

Change-Id: I9160e84bee62af3f2a75d58d264d068cd5b6b738