Scale widgets when dragging and dropping in multi-window mode.

This change mimics the non-MW mode behavior when dragging and
dropping widgets by taking the app widget scale into consideration.
This ensures a consistant drag and drop experience between
MW mode and non-MW mode.

* Uses cell data (cell height/width, spanX/Y) to get the expected
widget sizes.
* Scales sizes when necessary.

Bug: 32176631
Change-Id: Icdaf73ecd89a30e57fe7f405292d793f2d6a3ee8

src/com/android/launcher3/CellLayout.java

@@ -1041,7 +1041,7 @@ public class CellLayout extends ViewGroup implements BubbleTextShadowHandler {
                     // Offsets due to the size difference between the View and the dragOutline.
                     // There is a size difference to account for the outer blur, which may lie
                     // outside the bounds of the view.
-                    top += (v.getHeight() - dragOutline.getHeight()) / 2;
+                    top += ((mCellHeight * spanY) - dragOutline.getHeight()) / 2;
                     // We center about the x axis
                     left += ((mCellWidth * spanX) - dragOutline.getWidth()) / 2;
                 } else {