Moving model data structures to a separate file

Change-Id: I77ad7a5219e72d2e0d6c1803de2ac3ed6a65a8f7
diff --git a/src/com/android/launcher3/DropTarget.java b/src/com/android/launcher3/DropTarget.java
index ef02e87..0a0f9ad 100644
--- a/src/com/android/launcher3/DropTarget.java
+++ b/src/com/android/launcher3/DropTarget.java
@@ -25,6 +25,7 @@
 import com.android.launcher3.dragndrop.DragView;
 import com.android.launcher3.dragndrop.DraggableView;
 import com.android.launcher3.folder.FolderNameProvider;
+import com.android.launcher3.model.data.ItemInfo;
 
 /**
  * Interface defining an object that can receive a drag.