Porting PagedView from KG to gain simplified scaling model, reordering

-> We are no longer scaling individual Celllayouts, instead we are scaling
   the entire Workspace (and the CellLayouts come along for the ride)
-> Due to the above change, many assumptions were broken. In particular,
   our drag and drop / animation archiecture is fairly fragile due to the
   frequent and complex mapping of points between different bits of the
   hierarchy. This CL contains a number of fixes which address such
   breakages.

Change-Id: I2e630eab17528729b764b61f587858f6499fd318

src/com/android/launcher3/DropTarget.java

@@ -140,25 +140,6 @@ public interface DropTarget {
      */
     void onFlingToDelete(DragObject dragObject, int x, int y, PointF vec);
 
-    /**
-     * Allows a DropTarget to delegate drag and drop events to another object.
-     *
-     * Most subclasses will should just return null from this method.
-     *
-     * @param source DragSource where the drag started
-     * @param x X coordinate of the drop location
-     * @param y Y coordinate of the drop location
-     * @param xOffset Horizontal offset with the object being dragged where the original
-     *          touch happened
-     * @param yOffset Vertical offset with the object being dragged where the original
-     *          touch happened
-     * @param dragView The DragView that's being dragged around on screen.
-     * @param dragInfo Data associated with the object being dragged
-     *
-     * @return The DropTarget to delegate to, or null to not delegate to another object.
-     */
-    DropTarget getDropTargetDelegate(DragObject dragObject);
-
     /**
      * Check if a drop action can occur at, or near, the requested location.
      * This will be called just before onDrop.
@@ -177,7 +158,7 @@ public interface DropTarget {
     boolean acceptDrop(DragObject dragObject);
 
     // These methods are implemented in Views
-    void getHitRect(Rect outRect);
+    void getHitRectRelativeToDragLayer(Rect outRect);
     void getLocationInDragLayer(int[] loc);
     int getLeft();
     int getTop();