Updating the preview generation logic so that it aligns better with

the drag source image

> Using common code for pending item drag (WidgetContainerView and PinItemDragListener)
> Adding a shortcut-circuit in Workspace when a pendingItem can create a shortcut
  directly. Previously the multi-window drop was routing through onActivityResult which
  was causing some state information to be lost.

Bug: 33584624
Change-Id: I0259870032185713caa9bff27092dbae6ce91199

src/com/android/launcher3/ButtonDropTarget.java

@@ -229,7 +229,7 @@ public abstract class ButtonDropTarget extends TextView
             }
         };
         dragLayer.animateView(d.dragView, from, to, scale, 1f, 1f, 0.1f, 0.1f,
-                mLauncher.getDragController().isExternalDrag() ? 1 : DRAG_VIEW_DROP_DURATION,
+                DRAG_VIEW_DROP_DURATION,
                 new DecelerateInterpolator(2),
                 new LinearInterpolator(), onAnimationEndRunnable,
                 DragLayer.ANIMATION_END_DISAPPEAR, null);