Cancel drag upon screen lock

ash/drag_drop/drag_drop_controller.h

Index: ash/drag_drop/drag_drop_controller.h
diff --git a/ash/drag_drop/drag_drop_controller.h b/ash/drag_drop/drag_drop_controller.h
index 8c4e6bbefc9c9783556f1a5188ae2550914a6370..a23ed913f2ad46407807b3fc94b0f7812a5a2b18 100644
--- a/ash/drag_drop/drag_drop_controller.h
+++ b/ash/drag_drop/drag_drop_controller.h
@@ -34,6 +34,7 @@ class DragDropControllerTest;
 namespace internal {
 
 class DragDropTracker;
+class DragDropTrackerDelegate;
 class DragImageView;
 
 class ASH_EXPORT DragDropController
@@ -127,6 +128,7 @@ class ASH_EXPORT DragDropController
   base::Closure quit_closure_;
 
   scoped_ptr<ash::internal::DragDropTracker> drag_drop_tracker_;
+  scoped_ptr<DragDropTrackerDelegate> drag_drop_window_delegate_;
 
   ui::DragDropTypes::DragEventSource current_drag_event_source_;