Add logging for NPE (issue 11627249)

            icon.clearPressedOrFocusedBackground();

        }

        if (child.getTag() == null || !(child.getTag() instanceof ItemInfo)) {

            String msg = "Drag started with a view that has no tag set. This "

                    + "will cause a crash (issue 11627249) down the line. "

                    + "View: " + child + "  tag: " + child.getTag();

            throw new IllegalStateException(msg);

        }

        mDragController.startDrag(b, dragLayerX, dragLayerY, source, child.getTag(),

                DragController.DRAG_ACTION_MOVE, dragVisualizeOffset, dragRect, scale);