Merge "Implement splitting from Taskbar long-press" into tm-dev am: e15927ee

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/17530994



Change-Id: Ie75c167b0defbd15c1c36dd6c9cfd695e578b2e7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>