views: Make sure menu checks and submenu arrows have high contrast even when selected.

ui/views/controls/menu/menu_image_util.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_MENU_MENU_IMAGE_UTIL_H_
 #define UI_VIEWS_CONTROLS_MENU_MENU_IMAGE_UTIL_H_
 
 namespace gfx {
 class ImageSkia;
 }
 
 namespace views {
 
 // Returns the Menu Check box image (always checked).
 // The returned image is global object and should not be freed.
-const gfx::ImageSkia* GetMenuCheckImage();
+// |dark_background| should be true if the check will be displayed on a
+// dark background (such as a hovered menu item).
+gfx::ImageSkia GetMenuCheckImage(bool dark_background);
 
 // Return the RadioButton image for given state.
 // It returns the "selected" image when |selected| is
 // true, or the "unselected" image if false.
 // The returned image is global object and should not be freed.
-const gfx::ImageSkia* GetRadioButtonImage(bool selected);
+gfx::ImageSkia GetRadioButtonImage(bool selected);
 
 // Returns the image for submenu arrow for current RTL setting.
-const gfx::ImageSkia* GetSubmenuArrowImage();
+// |dark_background| should be true if the check will be displayed on a
+// dark background (such as a hovered menu item).
+gfx::ImageSkia GetSubmenuArrowImage(bool dark_background);
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_MENU_MENU_IMAGE_UTIL_H_