Fix bugs related to swipe up to home animation.

- Added ConstantState support for FolderAdaptiveIcon and
  ShiftedBitmapDrawable.
- Quick fix for NPE in Workspace#mapOverCellLayout while I investigate
  further.

Bug: 128460496
Change-Id: I5ec02e25dcf9f17aeb37928e675a033bdc8819ae

src/com/android/launcher3/Workspace.java

@@ -3084,6 +3084,10 @@ public class Workspace extends PagedView<WorkspacePageIndicator>
     }
 
     private boolean mapOverCellLayout(boolean recurse, CellLayout layout, ItemOperator op) {
+        // TODO(b/128460496) Potential race condition where layout is not yet loaded
+        if (layout == null) {
+            return false;
+        }
         ShortcutAndWidgetContainer container = layout.getShortcutsAndWidgets();
         // map over all the shortcuts on the workspace
         final int itemCount = container.getChildCount();