Merge "Only need to dismiss stage if one of the task is closed." into udc-dev am: 54d018e1de

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

Change-Id: I3a6fc1a672767fbd98b792cfadf133ea1771ceba
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>