Merge "Allow background activity launch by drag notification" into tm-qpr-dev am: d7e17f97

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/19967613



Change-Id: I50aa8b936a3208bd38dc248b1e00c155e5ec4f46
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>