views: Make view::Views::GetPreferredSize() const.

ui/app_list/views/top_icon_animation_view.h

 // Copyright 2014 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 UI_APP_LIST_VIEWS_TOP_ICON_ANIMATION_VIEW_H_
 #define UI_APP_LIST_VIEWS_TOP_ICON_ANIMATION_VIEW_H_
 
 #include "base/observer_list.h"
 #include "ui/compositor/layer_animation_observer.h"
 #include "ui/views/view.h"
@@ skipping 36 matching lines @@
   void RemoveObserver(TopIconAnimationObserver* observer);
 
   // When opening a folder, transform the top item icon from the small icon
   // inside folder icon to the full scale icon at the target location.
   // When closing a folder, transform the full scale item icon from its
   // location to the small icon inside the folder icon.
   void TransformView();
 
  private:
   // views::View overrides:
-  virtual gfx::Size GetPreferredSize() OVERRIDE;
+  virtual gfx::Size GetPreferredSize() const OVERRIDE;
   virtual void Layout() OVERRIDE;
 
   // ui::ImplicitAnimationObserver overrides:
   virtual void OnImplicitAnimationsCompleted() OVERRIDE;
   virtual bool RequiresNotificationWhenAnimatorDestroyed() const OVERRIDE;
 
   gfx::Size icon_size_;
   views::ImageView* icon_;  // Owned by views hierarchy.
   // Rect of the scaled down top item icon inside folder icon's ink bubble.
   gfx::Rect scaled_rect_;
   // true: opening folder; false: closing folder.
   bool open_folder_;
 
   ObserverList<TopIconAnimationObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(TopIconAnimationView);
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_VIEWS_TOP_ICON_ANIMATION_VIEW_H_