Merge "Introducing CellPosMapper which allows mapping between UI position and model position" into tm-qpr-dev am: 126ac14112 am: a19f661961

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/21128574

Change-Id: Id2cdf2a5262def0401cd2a60fbe89044f55a9c98
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>