Merge "Notify organizer about TaskFragment parent windowing mode change" into tm-dev am: 6725f73a am: 963dc4e9 am: 9385fc4b

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18032087



Change-Id: Ie71dcd27bb56a77c1e08cd49f2557898772c1089
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>