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

ash/frame/caption_buttons/frame_caption_button_container_view.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_FRAME_CAPTION_BUTTONS_FRAME_CAPTION_BUTTON_CONTAINER_VIEW_H_
 #define ASH_FRAME_CAPTION_BUTTONS_FRAME_CAPTION_BUTTON_CONTAINER_VIEW_H_
 
 #include "ash/ash_export.h"
 #include "ash/frame/caption_buttons/frame_size_button_delegate.h"
 #include "ui/views/controls/button/button.h"
@@ skipping 73 matching lines @@
   // HTNOWHERE if |point| is not over any of the caption buttons. |point| must
   // be in the coordinates of the FrameCaptionButtonContainerView.
   int NonClientHitTest(const gfx::Point& point) const;
 
   // Updates the size button's visibility based on whether |frame_| can be
   // maximized and |force_hidden|. A parent view should relayout to reflect the
   // change in visibility.
   void UpdateSizeButtonVisibility(bool force_hidden);
 
   // views::View:
-  virtual gfx::Size GetPreferredSize() OVERRIDE;
+  virtual gfx::Size GetPreferredSize() const OVERRIDE;
   virtual void Layout() OVERRIDE;
   virtual const char* GetClassName() const OVERRIDE;
 
  private:
   friend class FrameCaptionButtonContainerViewTest;
 
   struct ButtonIconIds {
     ButtonIconIds();
     ButtonIconIds(int icon_id,
                   int inactive_icon_id,
@@ skipping 43 matching lines @@
   // Mapping of the images needed to paint a button for each of the values of
   // CaptionButtonIcon.
   std::map<CaptionButtonIcon, ButtonIconIds> button_icon_id_map_;
 
   DISALLOW_COPY_AND_ASSIGN(FrameCaptionButtonContainerView);
 };
 
 }  // namesapace ash
 
 #endif  // ASH_FRAME_CAPTION_BUTTONS_FRAME_CAPTION_BUTTON_CONTAINER_VIEW_H_