Merge "Only need to dismiss stage if one of the task is closed." into udc-dev...

Merge "Only need to dismiss stage if one of the task is closed." into udc-dev am: 54d018e1 am: b22d16a1

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22779458



Change-Id: I4f248a3b111ba4c9193a5023404fadf5e854884f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>