Introducing CellPosMapper which allows mapping between UI position
and model position

Test: atest CellPosMapperTest
Bug: 188081026
Change-Id: If5c6b3df5ad240317bb535c675f6ead94084238e
diff --git a/src/com/android/launcher3/LauncherModel.java b/src/com/android/launcher3/LauncherModel.java
index 2c6458b..4472383 100644
--- a/src/com/android/launcher3/LauncherModel.java
+++ b/src/com/android/launcher3/LauncherModel.java
@@ -37,6 +37,7 @@
 import androidx.annotation.Nullable;
 import androidx.annotation.WorkerThread;
 
+import com.android.launcher3.celllayout.CellPosMapper;
 import com.android.launcher3.config.FeatureFlags;
 import com.android.launcher3.icons.IconCache;
 import com.android.launcher3.logging.FileLog;
@@ -165,9 +166,9 @@
 
     @NonNull
     public ModelWriter getWriter(final boolean hasVerticalHotseat, final boolean verifyChanges,
-            @Nullable final Callbacks owner) {
+            CellPosMapper cellPosMapper, @Nullable final Callbacks owner) {
         return new ModelWriter(mApp.getContext(), this, mBgDataModel,
-                hasVerticalHotseat, verifyChanges, owner);
+                hasVerticalHotseat, verifyChanges, cellPosMapper, owner);
     }
 
     @Override