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

ui/views/controls/button/label_button.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 UI_VIEWS_CONTROLS_BUTTON_LABEL_BUTTON_H_
 #define UI_VIEWS_CONTROLS_BUTTON_LABEL_BUTTON_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "third_party/skia/include/core/SkColor.h"
@@ skipping 57 matching lines @@
   void SetIsDefault(bool is_default);
 
   // Get or set the button's overall style; the default is |STYLE_TEXTBUTTON|.
   ButtonStyle style() const { return style_; }
   void SetStyle(ButtonStyle style);
 
   void SetFocusPainter(scoped_ptr<Painter> focus_painter);
 
   // View:
   virtual void SetBorder(scoped_ptr<Border> border) OVERRIDE;
-  virtual gfx::Size GetPreferredSize() OVERRIDE;
+  virtual gfx::Size GetPreferredSize() const OVERRIDE;
   virtual void Layout() OVERRIDE;
   virtual const char* GetClassName() const OVERRIDE;
 
  protected:
   ImageView* image() const { return image_; }
   Label* label() const { return label_; }
 
   // View:
   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
   virtual void OnFocus() OVERRIDE;
@@ skipping 49 matching lines @@
   gfx::FontList cached_bold_font_list_;
 
   // The images and colors for each button state.
   gfx::ImageSkia button_state_images_[STATE_COUNT];
   SkColor button_state_colors_[STATE_COUNT];
 
   // Used to track whether SetTextColor() has been invoked.
   bool explicitly_set_colors_[STATE_COUNT];
 
   // |min_size_| increases monotonically with the preferred size.
-  gfx::Size min_size_;
+  mutable gfx::Size min_size_;
   // |max_size_| may be set to clamp the preferred size.
   gfx::Size max_size_;
 
   // Flag indicating default handling of the return key via an accelerator.
   // Whether or not the button appears or behaves as the default button in its
   // current context;
   bool is_default_;
 
   // The button's overall style.
   ButtonStyle style_;
 
   // True if current border was set by UpdateThemedBorder. Defaults to true.
   bool border_is_themed_border_;
 
   scoped_ptr<Painter> focus_painter_;
 
   DISALLOW_COPY_AND_ASSIGN(LabelButton);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_BUTTON_LABEL_BUTTON_H_