shelf: Allow dragging items from main shelf to overflow shelf.

ash/test/shelf_view_test_api.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ASH_TEST_SHELF_VIEW_TEST_API_H_
 #define ASH_TEST_SHELF_VIEW_TEST_API_H_
 
 #include "ash/public/cpp/shelf_item.h"
 #include "base/macros.h"
 
@@ skipping 94 matching lines @@
 
   // Wrapper for ShelfView::SameDragType.
   bool SameDragType(ShelfItemType typea, ShelfItemType typeb) const;
 
   // Returns re-insertable bounds in screen.
   gfx::Rect GetBoundsForDragInsertInScreen();
 
   // Returns true if item is ripped off.
   bool IsRippedOffFromShelf();
 
-  // Returns true if an item is ripped off and entered into shelf.
-  bool DraggedItemFromOverflowToShelf();
+  // Returns true when an item is dragged from one shelf to another (eg.
+  // overflow).
+  bool DraggedItemToAnotherShelf();
 
   // An accessor for |shelf_button_pressed_metric_tracker_|.
   ShelfButtonPressedMetricTracker* shelf_button_pressed_metric_tracker();
 
  private:
   ShelfView* shelf_view_;
 
   DISALLOW_COPY_AND_ASSIGN(ShelfViewTestAPI);
 };
 
 }  // namespace test
 }  // namespace ash
 
 #endif  // ASH_TEST_SHELF_VIEW_TEST_API_H_