Added const to image parameters for ImageButton class.

views/controls/button/image_button.h

 // Copyright (c) 2010 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 VIEWS_CONTROLS_BUTTON_IMAGE_BUTTON_H_
 #define VIEWS_CONTROLS_BUTTON_IMAGE_BUTTON_H_
 
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "views/controls/button/custom_button.h"
 
 namespace views {
 
 // An image button.
 
 // Note that this type of button is not focusable by default and will not be
 // part of the focus chain.  Call SetFocusable(true) to make it part of the
 // focus chain.
 
 class ImageButton : public CustomButton {
  public:
   explicit ImageButton(ButtonListener* listener);
   virtual ~ImageButton();
 
   // Set the image the button should use for the provided state.
-  virtual void SetImage(ButtonState aState, SkBitmap* anImage);
+  virtual void SetImage(ButtonState aState, const SkBitmap* anImage);
 
   // Set the background details.
-  virtual void SetBackground(SkColor color, SkBitmap* image, SkBitmap* mask);
+  void SetBackground(SkColor color,
+                     const SkBitmap* image,
+                     const SkBitmap* mask);
 
   enum HorizontalAlignment { ALIGN_LEFT = 0,
                              ALIGN_CENTER,
                              ALIGN_RIGHT, };
 
   enum VerticalAlignment { ALIGN_TOP = 0,
                            ALIGN_MIDDLE,
                            ALIGN_BOTTOM };
 
   // Sets how the image is laid out within the button's bounds.
@@ skipping 31 matching lines @@
 //
 ////////////////////////////////////////////////////////////////////////////////
 class ToggleImageButton : public ImageButton {
  public:
   explicit ToggleImageButton(ButtonListener* listener);
   virtual ~ToggleImageButton();
 
   // Change the toggled state.
   void SetToggled(bool toggled);
 
-  // Like Button::SetImage(), but to set the graphics used for the
+  // Like ImageButton::SetImage(), but to set the graphics used for the
   // "has been toggled" state.  Must be called for each button state
   // before the button is toggled.
-  void SetToggledImage(ButtonState state, SkBitmap* image);
+  void SetToggledImage(ButtonState state, const SkBitmap* image);
 
   // Set the tooltip text displayed when the button is toggled.
   void SetToggledTooltipText(const std::wstring& tooltip);
 
   // Overridden from ImageButton:
-  virtual void SetImage(ButtonState aState, SkBitmap* anImage);
+  virtual void SetImage(ButtonState aState, const SkBitmap* anImage);
 
   // Overridden from View:
   virtual bool GetTooltipText(const gfx::Point& p, std::wstring* tooltip);
 
  private:
   // The parent class's images_ member is used for the current images,
   // and this array is used to hold the alternative images.
   // We swap between the two when toggling.
   SkBitmap alternate_images_[BS_COUNT];
 
   // True if the button is currently toggled.
   bool toggled_;
 
   // The parent class's tooltip_text_ is displayed when not toggled, and
   // this one is shown when toggled.
   std::wstring toggled_tooltip_text_;
 
   DISALLOW_COPY_AND_ASSIGN(ToggleImageButton);
 };
 
 }  // namespace views
 
 #endif  // VIEWS_CONTROLS_BUTTON_IMAGE_BUTTON_H_