mash: Support ShelfModel access in Chrome.

ash/shelf/shelf_view.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_SHELF_SHELF_VIEW_H_
 #define ASH_SHELF_SHELF_VIEW_H_
 
 #include <memory>
 #include <string>
 #include <utility>
@@ skipping 276 matching lines @@
       const ViewHierarchyChangedDetails& details) override;
 
   // Overridden from ui::EventHandler:
   void OnGestureEvent(ui::GestureEvent* event) override;
 
   // Overridden from ShelfModelObserver:
   void ShelfItemAdded(int model_index) override;
   void ShelfItemRemoved(int model_index, const ShelfItem& old_item) override;
   void ShelfItemChanged(int model_index, const ShelfItem& old_item) override;
   void ShelfItemMoved(int start_index, int target_index) override;
+  void ShelfItemDelegateChanged(const ShelfID& id,
+                                ShelfItemDelegate* delegate) override;
 
   // Handles the result of an item selection, records the |action| taken and
   // optionally shows an application menu with the given |menu_items|.
   void AfterItemSelected(
       const ShelfItem& item,
       views::Button* sender,
       std::unique_ptr<ui::Event> event,
       views::InkDrop* ink_drop,
       ShelfAction action,
       base::Optional<std::vector<mojom::MenuItemPtr>> menu_items);
@@ skipping 166 matching lines @@
   ShelfButtonPressedMetricTracker shelf_button_pressed_metric_tracker_;
 
   base::WeakPtrFactory<ShelfView> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ShelfView);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELF_SHELF_VIEW_H_