Adding fling-to-delete.

- Also fixing issue where the drop target icon changes color slower than the text.

Change-Id: I0bfa59da5d202016342f1c3de419ebcafd81ff6f
diff --git a/src/com/android/launcher2/DragSource.java b/src/com/android/launcher2/DragSource.java
index 06f5ee1..a654b93 100644
--- a/src/com/android/launcher2/DragSource.java
+++ b/src/com/android/launcher2/DragSource.java
@@ -25,5 +25,6 @@
  *
  */
 public interface DragSource {
+    boolean supportsFlingToDelete();
     void onDropCompleted(View target, DragObject d, boolean success);
 }