ash::ShelfView: CHECK against potentially bad static_casts.

ash/shelf/shelf_button.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_BUTTON_H_
 #define ASH_SHELF_SHELF_BUTTON_H_
 
 #include "ash/ash_export.h"
 #include "ui/gfx/shadow_value.h"
 #include "ui/views/controls/button/custom_button.h"
 #include "ui/views/controls/image_view.h"
 
 namespace ash {
 class ShelfButtonHost;
 class ShelfLayoutManager;
 
 // Button used for items on the launcher, except for the AppList.
 class ASH_EXPORT ShelfButton : public views::CustomButton {
  public:
+  static const char kViewClassName[];
+
   // Used to indicate the current state of the button.
   enum State {
     // Nothing special. Usually represents an app shortcut item with no running
     // instance.
     STATE_NORMAL    = 0,
     // Button has mouse hovering on it.
     STATE_HOVERED   = 1 << 0,
     // Underlying ShelfItem has a running instance.
     STATE_RUNNING   = 1 << 1,
     // Underlying ShelfItem is active (i.e. has focus).
@@ skipping 54 matching lines @@
 
    private:
     // Set to non-zero to force icons to be resized to fit within a square,
     // while maintaining original proportions.
     int icon_size_;
 
     DISALLOW_COPY_AND_ASSIGN(IconView);
   };
 
   // View overrides:
+  virtual const char* GetClassName() const OVERRIDE;
   virtual bool OnMousePressed(const ui::MouseEvent& event) OVERRIDE;
   virtual void OnMouseReleased(const ui::MouseEvent& event) OVERRIDE;
   virtual bool OnMouseDragged(const ui::MouseEvent& event) OVERRIDE;
   virtual void OnMouseMoved(const ui::MouseEvent& event) OVERRIDE;
   virtual void OnMouseEntered(const ui::MouseEvent& event) OVERRIDE;
   virtual void OnMouseExited(const ui::MouseEvent& event) OVERRIDE;
   virtual void GetAccessibleState(ui::AXViewState* state) OVERRIDE;
   virtual void Layout() OVERRIDE;
   virtual void ChildPreferredSizeChanged(views::View* child) OVERRIDE;
   virtual void OnFocus() OVERRIDE;
@@ skipping 41 matching lines @@
   // If non-null the destuctor sets this to true. This is set while the menu is
   // showing and used to detect if the menu was deleted while running.
   bool* destroyed_flag_;
 
   DISALLOW_COPY_AND_ASSIGN(ShelfButton);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELF_SHELF_BUTTON_H_