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: e17589f4 am: eb47b22c

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



Change-Id: I6245bfd1a423708870deb6e48d77fa38131f7a1c
Ignore-AOSP-First: this is an automerge
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>