Merge "Have the StackCoordinator attach the GroupExpansionManagerImpl to the Pipeline" into udc-dev am: 2fde820935

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22646453

Change-Id: Ief7c22fb07a2dc4ccd19f39870ee3547153fc4d7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>