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/ButtonDropTarget.java b/src/com/android/launcher2/ButtonDropTarget.java
index dc34d88..e9f8ce8 100644
--- a/src/com/android/launcher2/ButtonDropTarget.java
+++ b/src/com/android/launcher2/ButtonDropTarget.java
@@ -18,7 +18,7 @@
 
 import android.content.Context;
 import android.content.res.Resources;
-import android.graphics.Paint;
+import android.graphics.PointF;
 import android.graphics.Rect;
 import android.util.AttributeSet;
 import android.widget.TextView;
@@ -71,6 +71,10 @@
     public void onDrop(DragObject d) {
     }
 
+    public void onFlingToDelete(DragObject d, int x, int y, PointF vec) {
+        // Do nothing
+    }
+
     public void onDragEnter(DragObject d) {
         d.dragView.setColor(mHoverColor);
     }