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

ui/views/controls/label.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_LABEL_H_
 #define UI_VIEWS_CONTROLS_LABEL_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 158 matching lines @@
   // Gets/sets the flag to determine whether the label should be collapsed when
   // it's hidden (not visible). If this flag is true, the label will return a
   // preferred size of (0, 0) when it's not visible.
   void set_collapse_when_hidden(bool value) { collapse_when_hidden_ = value; }
   bool collapse_when_hidden() const { return collapse_when_hidden_; }
 
   // Overridden from View:
   virtual gfx::Insets GetInsets() const OVERRIDE;
   virtual int GetBaseline() const OVERRIDE;
   // Overridden to compute the size required to display this label.
-  virtual gfx::Size GetPreferredSize() OVERRIDE;
+  virtual gfx::Size GetPreferredSize() const OVERRIDE;
   // Returns the width of an ellipsis if the label is non-empty, or 0 otherwise.
-  virtual gfx::Size GetMinimumSize() OVERRIDE;
+  virtual gfx::Size GetMinimumSize() const OVERRIDE;
   // Returns the height necessary to display this label with the provided width.
   // This method is used to layout multi-line labels. It is equivalent to
   // GetPreferredSize().height() if the receiver is not multi-line.
-  virtual int GetHeightForWidth(int w) OVERRIDE;
+  virtual int GetHeightForWidth(int w) const OVERRIDE;
   virtual const char* GetClassName() const OVERRIDE;
   virtual View* GetTooltipHandlerForPoint(const gfx::Point& point) OVERRIDE;
   virtual bool HitTestRect(const gfx::Rect& rect) const OVERRIDE;
   virtual void GetAccessibleState(ui::AXViewState* state) OVERRIDE;
   // Gets the tooltip text for labels that are wider than their bounds, except
   // when the label is multiline, in which case it just returns false (no
   // tooltip).  If a custom tooltip has been specified with SetTooltipText()
   // it is returned instead.
   virtual bool GetTooltipText(const gfx::Point& p,
                               base::string16* tooltip) const OVERRIDE;
@@ skipping 94 matching lines @@
   SkColor enabled_shadow_color_;
   SkColor disabled_shadow_color_;
 
   // Space between text and shadow.
   gfx::Point shadow_offset_;
 
   // Should a shadow be drawn behind the text?
   bool has_shadow_;
 
   // The cached heights to avoid recalculation in GetHeightForWidth().
-  std::vector<gfx::Size> cached_heights_;
-  int cached_heights_cursor_;
+  mutable std::vector<gfx::Size> cached_heights_;
+  mutable int cached_heights_cursor_;
 
   DISALLOW_COPY_AND_ASSIGN(Label);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_LABEL_H_