mash: Create and show a shelf in mash.

ash/shelf/shelf.h

 // Copyright 2013 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_H_
 #define ASH_SHELF_SHELF_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 16 matching lines @@
 }
 
 namespace views {
 class View;
 }
 
 namespace ash {
 class AppListButton;
 class FocusCycler;
 class ShelfDelegate;
-class ShelfIconObserver;
 class ShelfView;
 class WmShelf;
 
 namespace test {
 class ShelfTestAPI;
 }
 
 // Controller for shelf state.
 // DEPRECATED: WmShelf is replacing this class as part of the mus/mash refactor.
 // Use WmShelf for access to state (visibility, auto-hide, etc.).
@@ skipping 35 matching lines @@
   // when dragging panels to reposition them with respect to the other panels.
   void UpdateIconPositionForWindow(WmWindow* window);
 
   // Activates the the shelf item specified by the index in the list of shelf
   // items.
   void ActivateShelfItem(int index);
 
   // Cycles the window focus linearly over the current shelf items.
   void CycleWindowLinear(CycleDirection direction);
 
-  void AddIconObserver(ShelfIconObserver* observer);
-  void RemoveIconObserver(ShelfIconObserver* observer);
-
   // Returns true if the shelf is showing a context menu.
   bool IsShowingMenu() const;
 
   // TODO(jamescook): Migrate this to ShelfWidget.
   bool IsShowingOverflowBubble() const;
 
   // TODO(jamescook): Migrate to ShelfWidget::IsShelfVisible().
   bool IsVisible() const;
 
   void SchedulePaint();
@@ skipping 38 matching lines @@
 
   ShelfAlignment alignment_ = SHELF_ALIGNMENT_BOTTOM;
   ShelfAutoHideBehavior auto_hide_behavior_ = SHELF_AUTO_HIDE_BEHAVIOR_NEVER;
 
   DISALLOW_COPY_AND_ASSIGN(Shelf);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELF_SHELF_H_