Merge "Use new onStartSplitLegacy when starting split from overview" into...

Merge "Use new onStartSplitLegacy when starting split from overview" into tm-dev am: 8aead550 am: 1a300220

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/17779173



Change-Id: I9d130eb8e5d070dfd2f5f3fe6e94978eb0fbf8f3
Ignore-AOSP-First: this is an automerge
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>