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

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

Change-Id: Ia74b38af165fa317c4d562730652f960026912a0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>