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

ui/views/controls/styled_label.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 UI_VIEWS_CONTROLS_STYLED_LABEL_H_
 #define UI_VIEWS_CONTROLS_STYLED_LABEL_H_
 
 #include <list>
 #include <map>
 
@@ skipping 69 matching lines @@
   SkColor displayed_on_background_color() const {
     return displayed_on_background_color_;
   }
 
   void set_auto_color_readability_enabled(bool auto_color_readability) {
     auto_color_readability_enabled_ = auto_color_readability;
   }
 
   // View implementation:
   virtual gfx::Insets GetInsets() const OVERRIDE;
-  virtual int GetHeightForWidth(int w) OVERRIDE;
+  virtual int GetHeightForWidth(int w) const OVERRIDE;
   virtual void Layout() OVERRIDE;
   virtual void PreferredSizeChanged() OVERRIDE;
 
   // LinkListener implementation:
   virtual void LinkClicked(Link* source, int event_flags) OVERRIDE;
 
  private:
   struct StyleRange {
     StyleRange(const gfx::Range& range,
                const RangeStyleInfo& style_info)
@@ skipping 30 matching lines @@
 
   // The ranges that should be linkified, sorted by start position.
   StyleRanges style_ranges_;
 
   // A mapping from a view to the range it corresponds to in |text_|. Only views
   // that correspond to ranges with is_link style set will be added to the map.
   std::map<View*, gfx::Range> link_targets_;
 
   // This variable saves the result of the last GetHeightForWidth call in order
   // to avoid repeated calculation.
-  gfx::Size calculated_size_;
+  mutable gfx::Size calculated_size_;
 
   // Background color on which the label is drawn, for auto color readability.
   SkColor displayed_on_background_color_;
   bool displayed_on_background_color_set_;
 
   // Controls whether the text is automatically re-colored to be readable on the
   // background.
   bool auto_color_readability_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(StyledLabel);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_STYLED_LABEL_H_