Support defining X column layout for all apps as a display option.

Bug: 124967099
Change-Id: I7bf576759b3fa4f6ca617fbbd660541c12fd09ac

src/com/android/launcher3/allapps/AllAppsContainerView.java

@@ -312,6 +312,7 @@ public class AllAppsContainerView extends SpringRelativeLayout implements DragSo
                 + grid.cellLayoutPaddingLeftRightPx;
 
         for (int i = 0; i < mAH.length; i++) {
+            mAH[i].adapter.setAppsPerRow(grid.inv.numAllAppsColumns);
             mAH[i].padding.bottom = insets.bottom;
             mAH[i].padding.left = mAH[i].padding.right = leftRightPadding;
             mAH[i].applyPadding();