Merge "Tell vold about users sharing storage with each other." am: 140a69e9...

Merge "Tell vold about users sharing storage with each other." am: 140a69e9 am: 16e3a6a1 am: cc57b70b

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2189723



Change-Id: I72380550d4ccbc5feb435480573920ed60b4d58f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>